How can I monetize my app?

[ComfyApril]

Thnx for all examples. It's actually a game and I'm thinking to make money from giving users enough gameplay content so that some people would like to buy skins or extra levels. But I was thinking of how to add some other monetization ways. I was reading a lot about SDKs with ads but decided not to put them in my app. Does anyone know any SDKs without ads?