This document provides guidance on launching an effective user retention strategy for mobile apps. It discusses trends showing declining retention rates and increasing user acquisition costs. It then offers recommendations in several areas: understand your users and where they drop off; leverage personalized marketing programs like push notifications and emails; target users dynamically at different stages; implement deep links; choose an app retargeting provider; optimize and improve over time; and test native ads. The key takeaways emphasize starting testing to get stakeholder buy-in, using data to identify improvements and successes, enhancing the user experience through messaging, persisting with technical challenges, and constantly refining through testing.