I'm probably the only one in the world who hasn't tried himself in cryptocurrency and moreover in such games. But now I want to try too, but I need some advice.
If you like computer games, games on blockchains are exactly for you as you don’t only enjoy the game, but you also can earn money. In the majority of games you play and get different things that you can sell then in a marketplace. The most popular one is axie infinity, but it is not cheap to enter, you have to pay at least 1200$ to buy the whole team of Axies and start playing, so you had better look for some new games.
Except for Axie, which seems to not match your needs as you are not willing to invest money on the games you are looking for, i can ensure you that they are all a waste of time and you won't earn a fortune by gaming for the next decade. Please try to deny the idea that cryptocurrency is easy money.