Lost a world I worked on for almost a year.

Dear Mojang,

My Minecraft app on my iPad would not open up into the game. It just crashed every time I tried going into the game. I turned my iPad off and back on again, I refreshed the app several times, I adjusted my account. Nothing worked. I decided to reinstall the app. It finally worked again, but my world that I worked for almost a year on was gone. I don't know how to get this world back but if you could tell me, it would rejoice me if you could tell me how to get my world back. I spent a lot of time on it so please help me. I hope you fix this bug as well with many other devices that use Minecraft bedrock edition.