I spent a month building this Movies App https://play.google.com/store/apps/details?id=com.zoomentertainment.movies
and after 2 months i am making around $10 everyday. i forecast $1000 per month from October/November 2019.
The good thing with this one is that i did absolutely no advertising, i worked hard on its PlayStore description optimization to keep it in top 10 of commonly used keywords such as "Hollywood movies" "movies 2019" "films 2019" "hollywood 2019" etc...
Buddies, invest in Adwares, it's pretty good