Below are a few articles about how important both retention and engagement are! Gone are the days when app developers only focus on acquisition.
IMO... our Megastar app is ticking all the right boxes!!! Take a look!
http://info.localytics.com/blog/mobile-apps-whats-a-good-retention-rate
https://www.appcues.com/blog/3-cringeworthy-stats-on-customer-retention/
https://www.appboy.com/blog/app-engagement-6-stats/