Timing drives much of the result.
A reminder sent too early creates noise; too late and the customer may have already switched. Repurchase windows should reflect real category behavior and segment differences rather than one automation for everyone.
Time-to-repeat distributions are a practical starting point.
Not every lost customer is worth winning back.
Some customers have low margin, high refund rates or only purchase under deep discount. The cost of winning them back may exceed the value created.
Prioritization should consider historical value, likelihood to return and incentive cost.
The offer does not always need to be a discount.
Replenishment reminders, product education, new use cases, bundles or service benefits can reactivate demand. Discount should be one economically justified option—not the default response.
This matters especially when the business needs to protect margin.
Measure incremental lift.
Some customers would return without receiving a campaign. Holdout or test/control design separates revenue caused by the win-back from revenue that would have happened anyway.
Without that measurement layer, retention is easy to over-credit.