[2020] Made some changes to some game files and now I can’t host my own server.

I wanted to mod the game, mostly crafting requirements, XP gained crafting, starting equipment, calories gained from food, etc.

I could easily do this in the core game files outside of Unity, which I don’t really understand, and now I can start up my own server. Is there a way I can modify these files without preventing me from playing the game?