Just get a cheap/free 3d asset pack from itch.io and go nuts. It helps to know some concepts about 3d like UVs, normal/AO/specular etc maps, triplanar mapping, vertex colouring etc. but other than learning a bunch of new words it's not that difficult. But making 3d assets yourself is super time consuming.

There's also a lot you can do with 2d pixel art assets in 3d if you like a retro style. Godot has (Animated)Sprite3D which makes it very easy.

Though it may be fun, setting up a whole streaming platform and engaging an audience is a whole shitload of extra work on top of the actual gamedev, so if you have limited time best to really truly treat it as a hobby and squeeze in an hour or two on certain evenings or something.

I love Godot BTW, here's my latest project in it: https://twitter.com/TetrisMcKenna/status/1486629669252313088...