Stuck in world generating loading screen

I can’t play on world anymore, when I go to play on that world it says world generating then the green loading bar fills up and freezes. I went and ate some food and watched a YouTube video waiting for it to load which was about an hour and a half then I came back to the same screen. 

What I think caused this to happen is that I was fighting the ender dragon for the third time and died, and out of frustration(mainly the way I died) I closed app and now my world won’t load when I want to play again.