To Improve the visibility of app how it is performing one way is to implement user based analytics in the Firebase.
Use 'user id' key for firebase analytics (don't use login username, it is mobile no)

Steps to test and view User based Analytics:
login to Firebase >> select 'Saksham-Assam' project Go to 'Analytics Dashboard' >> open 'Google Analytics':
To see different User activity like below:
1. User activity over time
2. Events >> all API calls