Milestones & anniversaries: small touches, automated

First-purchase anniversaries, Nth-order thank-yous, and spend milestones are cheap, automated moments of goodwill, small touches that customers remember far beyond their cost.

Milestone messages (first-purchase anniversary, 5th-order thank-you, a spend threshold, a birthday they gave you) are the highest goodwill-per-dollar automation in retention: specific, personal, and unexpected. The rules: tie each to a real trigger, keep the message about them not about selling, and never fake specificity. AI drafts the map and the copy; your data fires them automatically.