My YouTuber world is gone

Hello! I have an bug on Minecraft.. So this is Minecraft on mobile but Whenever you remove Minecraft and then download it, then it sitll has yuor worlds if u log into yuor account? For me my worlds are gone.. My city world is gone and I took 2 year on it so is there anyway to bring it back? But also the world broke down. The blocks didn't load.. please fix this (Minecraft user: dante dankha)