World keep corrupting and not loading

We have this minecraft world that we have been play on for a year now, and for the past few months the world would crash and say that it is corrupted but it isn't because we can keep playing on, but also pets on the world some times randomly get deleted from the game. But recently the world has been having issues, the more we play on it the more it seems to die. And them today when we try to play on the world, it just comes up with an error and says we can't load into the world. I would like there to be a solution because the world is very nice and has a lot of symbolic meaning to lots of people. We also celebrated its one year anniversary so please try and find a way so that we can play in that world again.