Use API or SDK to track user actions in the app and identify bottlenecks, steps with high drop-off rate, and monetization issues.
Connect App Stores to track and compare the main metrics from there.
Integrate data from attribution trackers and ad network platforms: Adjust, Branch.io, Kochava, Tenjin, AppsFlyer, Tune.
Measure the incoming traffic performance based on general traffic metrics and user behavior in the app. Also, you will be able to track ad revenue by networks and countries.