Who is your customer? Each application solves particular problem for particular group of people. And you need to know as much as possible about them? Gender, age, working/non-working, kids, free time, what are their problems you are trying to solve, do they keep, focus, what colors do they prefer, what kind of subscriptions can they pay? etc, etc... Once you have this information, you know how to create a product that will be used, or at least the chances are bigger. If you do int differently, it can work, but it is a pure gamble how things will go on.
Usually, this is the beginning of everything, before you write any code. You make this for other people, you need to know what other people need and look for.
Talk to people, make interviews, do analysis of the results, see what's missing...
I searched for your product in Google Play but could not find it. I wanted to have a look and give honest opinion.