Design is the key for more user. And a very good design can increase more user engagments then a OK design.
I will help you with these:
Every app has some functionality which can made a app great. Which is the heart of an App.
I follow these rules when devloping:
You have made your app and you want people to use it then you have to publish it to the market.
I will help you to publish your apps on the store: