Win back customers who quietly stopped coming

Help me win back customers who've stopped coming, without sounding desperate.

My business: [e.g. hair salon in Leeds, dog groomer, garage, online candle shop]
How often a regular normally comes back: [e.g. every 6 weeks, once a year for the MOT]
What I can offer to tempt them back: [e.g. a free add-on, first pick of dates, nothing, just a friendly hello]
How I can reach them: [e.g. text, email, WhatsApp, a card in the post]
Anything new they'd want to know: [e.g. new staff, later opening, online booking]
Today's date: [date]

My customer list (name or reference, last visit or order date, rough spend, notes):
[paste the rows]

Before you start, ask me up to 4 short questions, for example whether anyone left after a complaint. Wait for my answers.

Then:
1. Split the list into three groups: overdue regulars to contact first, occasional customers for a lighter touch, and people to leave alone. Give a one-line reason for each person.
2. Write 3 short messages for the first group: a friendly check-in, a reason to come back, and a last gentle nudge. Keep each under 60 words, sounding like me, not like a marketing email.
3. Suggest when to send each one, and how to reply if someone comes back with a complaint.
4. Give me a simple tracker table: name, group, message sent, date, replied, booked.
5. Tell me one change that would stop regulars drifting off in future, based on what you see in my list.

Use only the customers and details I've given you, and don't promise offers I haven't listed. Remind me to leave out anyone who's asked not to be contacted. UK English. Add a simple opt-out line to each marketing message (e.g. "Reply STOP if you'd rather not hear from me"), and remind me to message only past customers who haven't opted out; I'll check the ICO's guidance on marketing texts and emails.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.