My game is chaotic.

Today I went to play in my modified world (RealismCraft) and added more add-ons, but it was all a mess. When I entered, the download screen turned purple and black, the game crashed, and after that I can't access the world anymore. I removed the add-ons I added and even reinstalled the game. Nothing worked. I want to go back to playing and I don't want to lose my progress. I've been playing for a while, not that my time has been wasted. Please help me.Furthermore, now the world asks you to download everything again when reinstalling, but it's already downloaded and keeps downloading indefinitely.