How to get more business from existing clients, starting with three lists you already have.

A first project, even a small $2,500 one, often ends with an invoice and a thank-you, and what comes next doesn't come up. That wrap-up is where I start when a founder asks how to get more business from existing clients, because the client already trusts the work and the team already knows what else needs fixing. One client's account owners sent a three-line email to 60 existing clients, and 11 replied with a new project to scope, all within 72 hours.

Why the next sale usually comes from someone who already knows you.

6sense surveyed nearly 4,000 B2B decision makers in 2025, each with at least $25,000 in purchases over the prior two years. Of those, 85% had prior experience with the vendor they chose, and 75% said they personally know sellers at the vendors they evaluate. 6sense sells account-based marketing software and the answers are self-reported, which makes the figures a direction, not a measurement, and the direction is clear: prospects pick the shortlist from names they already know, and 95% of the time they buy from it.

Most B2B purchases go to a vendor the prospect already knows.

6sense 2025 survey of nearly 4,000 B2B decision makers, %

Most B2B purchases go to a vendor the prospect already knows.

Item	Value
Purchases that went to a Day One shortlist vendor	95%
Had prior experience with the winning vendor	85%
Personally know sellers at vendors they evaluate	75%

A past client who thinks of you when a new problem comes up puts you on that shortlist, and one who hasn't heard from you in two years may not. More on this in how customers decide what to buy.

In September 1983, Theodore Levitt of Harvard Business School argued in Harvard Business Review that a selling relationship "seldom ends when a sale is made," and that what follows helps decide the next purchase. For you, that moment is the wrap-up call in step 2, and it shapes who the client calls next time.

Daniel Levin, Jorge Walter and Keith Murnighan asked 224 executive MBA students to reconnect with two people they hadn't spoken to in at least three years and ask for advice on a work project (Organization Science, 2011). The dormant contacts gave advice as useful as current ones, often more, and in a second group of 116 executives the tenth name on each list proved as valuable as the first.

The study measured advice, not sales. What carries over is the hesitation the executives described, inertia, embarrassment and the fear of looking opportunistic, which the steps below are built to get past.

Step 1. Build three lists in one afternoon.

Each list gets one line per person about what they did, and every message starts from it.

1. Existing and past clients. Every closed deal in the last three years, with the project and the result ("2026-11-past-clients").
2. People who referred you. Who they introduced and what came of it ("2026-11-referrers").
3. Your network. Past customers, former coworkers now in roles that buy what you sell, and people at companies you want to work with ("2026-11-network").

Where to pull them:

• HubSpot or Salesforce. A report of closed-won deals for the last three years, by company, with the contact and owner.
• Mailchimp or Constant Contact. Tag the same contacts and hold them out of campaigns while the notes go out.
• No CRM. Your invoices or accounting software, one row per client.
• LinkedIn. Click Me, then Settings & Privacy, Data privacy and Get a copy of your data, and request the archive that includes connections. Email addresses come through only for connections who allow it. Use those addresses for one-to-one messages, never a Mailchimp or Constant Contact import.

On the network list, mark each person's group, then add a "do not contact" column and check every name for job changes and open complaints. A client in a dispute gets a call, not a note.

At a larger company, pull the lists by account owner, check the ticketing system for open issues, and give each account one owner for the month, which keeps two people from writing to the same client. Marketing builds the lists, and account owners send.

Step 2. Bring up the next project before the first one ends.

1. Before the first project ends, write down two needs you noticed that weren't in the scope.
2. At the wrap-up call, share the results first, then the two things you noticed.
3. Offer the smaller of the two as a clear next step with a fixed price.
4. Book a check-in for 30 days after the project closes.

The smaller offer is an easy yes for a client who just paid you, and it keeps the bigger need open. This works when the first project went well, and a shaky one needs fixing first. For public-sector clients, ask if a fixed-price add-on needs a contract change. For clients between projects, a three-line email naming a goal they told you about does the same job (the three-line client email).

At a larger company, add a "two things we noticed" field to the project close-out template. The delivery lead fills it in, the account manager runs the wrap-up, and the expansion deal goes into the CRM the day the offer is made.

Step 3. Reopen your network, 10 people a week.

A C-level executive at an education technology company had 2,400 LinkedIn connections built over two decades, and I suggested starting with a spreadsheet.

The executive sorted the connections into the three groups and wrote to 10 a week, one short message each that named something particular to that person and pitched nothing. Anyone who replied got one question back, about what their team was working on this year. Over three months, about 120 people heard from the executive, 41 replied, nine turned into meetings and two became sales opportunities.

41 of about 120 people replied when the message asked for nothing.

Three months of 10 messages a week from one executive's LinkedIn network

41 of about 120 people replied when the message asked for nothing.

Item	people
Heard from the executive (about)	120
Replied	41
Meetings	9
Sales opportunities	2

That's about a third of the people messaged. Instantly, which sells cold email software, puts the average cold email reply rate at 3.43% in its 2026 benchmark report, dividing replies by every email its platform sent in 2025, follow-ups included. The network figure divides by people, and the audiences differ, which makes the gap look wider than it is.

Write each message from the line in the sheet and ask nothing in the first one. Send by hand, because LinkedIn's User Agreement bars bots and unauthorized automated methods for sending messages. Claude or another AI tool can draft from the line, and you rewrite it in your own words.

At a larger company, each executive or account lead works their own network, and nobody sends from someone else's account.

Step 4. Send thank-you notes with nothing to sell.

Four groups get a note: new clients, clients who came back, people who referred someone, and your team. Name something specific, like a project, a result or an introduction. Referrers often don't hear what happened after the introduction, and telling them is the note.

Robert Palmatier and colleagues studied gratitude for the Journal of Marketing in 2009, first in a lab experiment with 155 students reading a retail scenario, then in a survey of 446 business customers of 31 industrial sales firms, matched to sales records. Gratitude generated by a seller's relationship investments drove purchase intentions, sales growth and share of wallet through reciprocal behavior. A thank-you note is one of those investments, as long as it isn't an offer in disguise.

Send each one from the relationship owner's inbox, after the same job-change and complaint check. The FTC's CAN-SPAM guide sorts email by primary purpose and makes no exception for business-to-business email. Under that test a note with no promotion isn't a commercial message, which is a reading of the guide, not legal advice. CAN-SPAM is US law, and Canada (CASL) and the UK (PECR) have their own rules.

At a larger company, account leads write to their clients, the founder writes to the top referrers, and nobody gets two thank-yous from the same company.

Step 5. Track repeat business as its own number.

Keep repeat deals out of the new business pile, or nobody can see if the wrap-up works.

• HubSpot. The default Deal type property comes with New Business and Existing Business, and you can edit or add types.
• Salesforce. The standard Opportunity Type picklist. Check which of your org's values marks a returning client, and add one if none does.
• No CRM. A "type" column in the deal sheet.

At a larger company, ask the CRM admin to split Existing Business into "Renewal" and "Expansion", because expansion is the number the wrap-up step moves. In HubSpot, make it required on the create-deal form, which covers deals created by hand.

Tag the outreach without touching the original source, with a custom "Outreach group" contact property in HubSpot, a campaign in Salesforce or a column in a sheet, named "2026-11-network". Leave Lead Source and Original Traffic Source alone, because past customers on the list usually already have one (the CRM audit checklist covers fields and a weekly check).

A worked example with numbers.

Example numbers: a firm signed 40 first-time clients in 2025, and eight of them signed a second project within 12 months of their first. The repeat rate is 8 ÷ 40, or 20%. The firm adds the wrap-up step to every first project. If the next 40 first-time clients come back at 30%, that's four more second projects, and at an average of $12,000 each, $48,000 from clients who already paid once.

How to get more business from existing clients in 30 days, the plan to copy.

Common mistakes, and the pushback a specialist would raise.

"We already send a client newsletter." Keep it. A newsletter keeps your name in front of the list, and it can't bring up the two needs you noticed on one client's project.

"A reply rate of about a third can't be compared with cold email." Agreed, message for message. The test puts replies per person next to your own last cold campaign, counted the same way, as a read on what an hour of writing returns.

"Clients will see the wrap-up offer as a sales push." The order usually keeps it from reading that way: results first, then what you noticed, then the smaller of the two at a fixed price, which a client can decline in one line.

Three more to avoid: a referral ask inside a thank-you note, leading with the bigger project at the wrap-up, and judging the network habit after two weeks.

A test you can run in four weeks.

1. Pick 40 people from the network list, across the three groups.
2. Send 10 a week for four weeks, by hand, with no pitch.
3. Log date sent, reply, meeting booked and any opportunity within 90 days.
4. Put the reply rate next to your last cold campaign's, counted the same way, replies ÷ people contacted.

A useful bar is at least 10 replies from the 40, or three times your cold rate if that's higher, and at least one meeting. Judge replies and meetings two weeks after the last batch and opportunities at day 90, and treat 40 messages as a directional read. If you miss it, look at the one-line notes first, because a message that could go to anyone usually gets a cold reply rate.

Frequently asked questions.

How do you ask past clients for more business?

Start with what you noticed, not a pitch. Before a project ends, write down two needs outside the scope. At the wrap-up, share the results, name both needs and offer the smaller one at a fixed price. For older clients, send a short note about a goal they once mentioned.

How do I download my LinkedIn connections?

Click Me, Settings & Privacy, Data privacy, then Get a copy of your data, and request the archive that includes connections. LinkedIn emails a link when the file is ready. Email addresses come through only for connections who allow it. Use them for one-to-one messages only.

What should a thank-you note to a client say?

Name one specific thing, like the project, the result or the introduction they made. Keep it to two or three sentences from the person who owns the relationship, with no offer. For a referrer, say what happened after the introduction. Check first that they're still at the company and have no open complaint.

How do you ask past clients for referrals?

Keep it apart from the thank-you note. Close the loop on any earlier referral first, then ask for a specific kind of introduction, like one person at a company opening a new location this year, which is easier to answer than "know anyone who needs us?" More in growing past referrals with the leads in your CRM.

Sources.

• 6sense, 2025 B2B Buyer Experience Report, 2025. 6sense
• Theodore Levitt, After the Sale Is Over, Harvard Business Review, September 1983. HBR
• Daniel Z. Levin, Jorge Walter and J. Keith Murnighan, Dormant Ties: The Value of Reconnecting, Organization Science 22(4), 2011. DOI
• Daniel Z. Levin, Jorge Walter and J. Keith Murnighan, The Power of Reconnection: How Dormant Ties Can Surprise You, MIT Sloan Management Review, Spring 2011. MIT SMR reprint
• Robert W. Palmatier, Cheryl Burke Jarvis, Jennifer R. Bechkoff and Frank R. Kardes, The Role of Customer Gratitude in Relationship Marketing, Journal of Marketing 73(5), 2009. DOI
• Instantly, Cold Email Benchmark Report 2026, 2026. Instantly
• LinkedIn Help, Export connections from LinkedIn, checked 2026-10-22. LinkedIn Help
• LinkedIn, User Agreement, effective November 3, 2025. LinkedIn
• HubSpot Knowledge Base, HubSpot's default deal properties, updated September 29, 2026. HubSpot
• HubSpot Knowledge Base, HubSpot's default contact properties, updated September 21, 2026. HubSpot
• HubSpot Knowledge Base, Create and edit properties, updated October 19, 2026. HubSpot
• HubSpot Knowledge Base, Set up fields seen when manually creating records, updated September 9, 2026. HubSpot
• Mailchimp Help, All the Segmenting Options, checked 2026-10-22. Mailchimp
• Constant Contact Knowledge Base, Filter your contacts by tags when sending or scheduling an email, updated September 1, 2026. Constant Contact
• Salesforce, Object Reference for the Salesforce Platform: Opportunity and CampaignMember, version 258.0, checked 2026-10-22. Salesforce Developers
• Federal Trade Commission, CAN-SPAM Act: A Compliance Guide for Business, August 2023, edited January 2024. FTC
• Innovation, Science and Economic Development Canada, Canada's anti-spam legislation, modified July 15, 2024. Government of Canada
• Information Commissioner's Office, What are PECR?, checked 2026-10-22. ICO