Start with the relationship you can see.
Bring customer identifiers, dated purchases or activity, product choices and subscription status where available. Review the observation period, missing records, returns and contact permissions with your team. Existing campaign history adds context about earlier outreach and the responses that followed.
Measure a stronger relationship.
Define the outcome before planning: a return purchase, a renewed subscription or sustained activity within a chosen period. Track margin and contact pressure alongside retention. Compare outcomes with a suitable untreated group where practical, rather than crediting every returning customer to the campaign. Use observed responses to check and improve the estimates behind the next decision.