What can you program to earn a lot of money? I'm 19, can do Java with OOP but don't want to make websites (I don't like that)
Maybe something along the lines of Solidity?
You're the one who need to find out what you can do and expecting someone from online to give an advice about how to make money specifically would always end of getting scammed.
You said you got the knowledge now all you need to do is how to monetize it.
As first you can take some course for others to make decent money on freelancing sites if you don't really want to work for someone.