In addition to Christian's answer, you can also do a side thing by making a YouTube channel and uploading videos that you know will get a lot of views. I believe every 1,000 views is $1, and if you have multiple videos and they slowly get more and more views, that could be something you can do on the side to save up money.
Some famous YouTube channels that do this are PewDiePie, Markiplier, Lordminion777, Jacksepticeye, and muyskerm (fairly new). There's plenty more, but I can't remember their names off the top of my head. What you basically need to do is play games for the fun of it, because if you're uploading videos just because you need the money and are only focusing on that, then you're not having fun, and you'll feel de-motivated to continue uploading videos on your channel.