A customer who already paid you once is worth more than a cold lead and a lot cheaper to reach. But once the job is done, most service businesses never contact that customer again. They drift, and the next time they need work they call whoever shows up first in a search.

This blueprint runs every Monday and pulls everyone on your customer list who has not had service in 90 days or more. For each one it writes a short text that mentions their last job type, sends it through Twilio, then follows up with a seasonal offer email through Gmail. It stamps the date on your sheet so the same customer never gets the sequence twice.

You get the n8n workflow JSON, a step-by-step setup guide, and a limb spec for integration teams. Setup takes about 35 minutes. Works with Google Sheets, OpenAI, Twilio, and Gmail. The text is written by gpt-4o-mini at roughly a hundredth of a cent per message, so reaching a few hundred old customers costs pennies.