First off, I know that someone has already talked about an issue somewhat similar to this one but im going to say it anyway, because mine is different.

I made a world maybe 2-3 weeks ago and have loved the modpack so far, but then one day, i go to log in and it just stops on "Loading Terrain", no crash, just stops, and i force close the game after a bit. i then go and reopen the game, and do all the stuff again, and this time it does it again, so i repeat again, i reopen my world and it just plain crashes, and i have no idea what is going on.

(sorry if this is confusing, im extremely tired rn)

I'm having the exact same problem, are you playing online or solo?
I'm playing on a solo world through Curse Forge.