Finding new customers matters. It can also be worth looking at the service history of people who already know your work.
Past records may suggest a useful conversation: maintenance coming due, a service agreement nearing renewal, or a recommendation that was noted during a visit.
Choose one relevant group
Start with a small, clear question. Which customers have a recorded maintenance date approaching? Which recommendations were left open? Avoid assuming everyone who bought the same item needs the same offer.
Check the information
Equipment age, work completed and contact details may be incomplete. Review a sample before relying on a list. Check whether the customer can appropriately be contacted and respect their communication preferences.
Make the reminder useful
Refer to the service history accurately and explain why you are getting in touch. Let the customer decide whether it is relevant. A reminder should not imply equipment is failing simply because it has reached a certain age.
See what the records are good for
Your existing software may support the search and follow-up. If the records need work first, start there. How easy would it be to find one group of customers with a genuine reason for a check-in?