I was in a similar position as you two years ago. I had an app with steady sales, I handled rate customer requests, but for the most part didn't know how to imp

I was in a similar position as you two years ago. I had an app with steady sales, I handled rate customer requests, but for the most part didn't know how to improve my app and ended up wasting lots of time. Then I realized that my app was finished. There was nothing to improve. I concluded that there was only one possible thing to do: start something new. I made enough from my first app to support the family, and started working on my second app. Now I have two apps earning money. Also, 15h per day is way too much. I work an average of 4h per day, any longer and I lose concentration (unless I'm cranking out some interesting new code, then I work any minute my kids let me)