World went corrupt, tried everything please help.

my world has gone corrupt and i know which one it is, ive tried every youtube video and it wont work, ive even tried to delete and redownload, thats what started the problem in the first place, After i did it 3 times, it came back but it wouldnt let me access the world.it simply said "failed to load world". It went from saying my world to 1n-yya