Nice to know you are still progressing despite difficulties. I hope you got a good deal with your computer. I got mine fixed awhile ago but a bad stick of ram from the upgrades has me waiting for parts again lol.
I'm curious is it cheaper to use 3D models or 2D sprites? With the turn based nature of the game perhaps you can switch to a 2D or even "paper RPG" artstlye. Regardless of the solution, I hope you find one as collecting many different characters is a huge part of the fun with gacha.
Best wishes in the new year, I look forward to the next version!