Building and launching your app doesn’t mean your work is over. You should be constantly updating it.
Monitoring your app over time gives you key insights into how your users feel about your app. Keeping track of customer feedback and market trends helps you stay updated with changing user preferences, problems, and habits.
Do not seek praise. Seek critisism
A Few Musts; 1: Add New Feature Updates, 2: Ensure app support with new hardware/software, 3: Keep your user interface updated, 4: Fix bugs in a timely manner, 5: Monitor performance, 6: Offer scheduled system maintenance, and 7: Keep a check on licenses (if you have them).