minecraft crashes when loading a certain world

Whenever i try to get into a certain world, the app crashes. it is the biggest world in my minecraft. it loaded perfectly an hour before, but it suddenly doesn’t work. i’ve also made a copy of that world, but it crashes too. ive tried to get in other worlds, and it works. ive also tried getting into friends’ worlds and it works too. it’s just the one world that crashes. my friends and i have spent around 200 hours on it.