Investing in post-churn user journeys can offer surprising ROI by winning back churned users.Strategies to win back churned users involve nudging them to return and making them stick.Nudging users to come back includes sharing what's new, using case-sensitive communication, and retargeting ads.Winning over returning users requires nailing the reactivation experience and offering special discounts.Understanding why users churned can help improve post-churn UX with better messaging and targeting.Post-churn UX is worth it for products that offer long-term value and have a high margin per customer.Deciding to invest in post-churn UX involves evaluating metrics like churn rate, re-engagement, retention, and cost.Calculating the ROI on winback actions is essential to determine the effectiveness of post-churn UX investments.Invest in post-churn UX if there is a 300% ROI, otherwise focus on core product development to avoid churn.