Ask HN: What to do with my Android app users

I have an Android app with around 800 users per months and I don't what to do with it. Any ideas?

The app is: https://play.google.com/store/apps/details?id=com.ym705.makeawish&hl=en

It's a simple app where people can make a wish, they type their wish (less than 200 characters), select an image that fit with their dreams and that's all.

I initially developed the app to practice with Firebase, and once the user made a wish he can explore the other people wishes and like them (act like favorites).

I have small ads on the app that bring few money and I was wondering how could I change this ap to a true income and also make it useful....

Maybe selling card/magnet or something with the wish printed?

Selling lucky charm that fit the wish type?

Thanks everyone!