I know this post is nearly a year old but whatever. There are so many goddamn tutorials on YouTube, why are you having so much trouble figuring out how make a gacha mod? Also, I'm pretty sure itch.io isn't really the best place to post questions like these. You will most likely get little to no answers at all. Post gacha stuff in a gacha community, you will get far more attention there, I don't really know any as I'm not a creator but you can look around.