Realm /World problems /Game Crashes

Hi lately I been having a huge issue with Minecraft Pe on my iPhone 11 Pro Max . 
the issue it's so bad that I can't even open the app , the game crashes before event uploading . When it does upload rarely I also noticed my realm world every time I walk by a sudden spot of the world it crashes and it's only the same spot . There's also like a bug when you try to invite people it don't even show your friends or nothing . My main issue is my realm world & being able to use the app I don't want to looses the work I been doing for a year and also would be super nice to be able to actually play Minecraft . Please help the game also says resource failed something like that. But it crashes .

I will upload a screen recording of my problem with at least opening the app my second problem it's the world crashing out of nowhere in a sudden spot I can't even walk or build .