Your email should have a logical flow - from addressing the problem or the reactivation need, to introducing the solution, and then leading to a clear CTA.
Break your audience into segments (such as users who purchased recently vs users who haven’t interacted in a long time) to get more targeted and leave greater impact.
If a subscriber is not interested in re-engaging, respect their decision and allow easy cancellation. You risk damaging your brand image by making the process difficult.