Games to Play for Free Money

I'm 18 and I'm currently on summer vacation. Classes don't start until October. I have a lot of free time on my hands and I'm getting bored. I wake up, eat, watch anime, and play a few mobile games. I was thinking of making better use of my time by playing games that may be a source of income, like Axie Infinity. Although, it would be better if I didn't have to pay for anything to begin playing (like Axie). It would also be better if the game was online. If you guys could help me, I'd greatly appreciate it. I just don't know any game that suit my desires.

Thanks in advance guys!

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P.S. I'm currently using a 2015 MacBook Air.