I lost my world because was damaged and cant load cloud saves

I have recently purchased the Xbox series x and by making the transfer I have not been able to re-download my world to which I have dedicated so many years, I only have an old version accessible thanks to a copy but I would like to recover the latest version as I had spent so much time. I don't know if the world was actually damaged due to the transfer from one console to another also because in reality after the update my worlds were no longer visible on Xbox one and I had to re-download them. I think there was a problem with the minecraft update. I have tried on both xbox x series and one but in both cases I cannot access the world because it is damaged. I kindly ask to have my world back also because some time ago I already lost another one on Xbox 360 due to an error and I would not like to recap