Corrupted Score

I was aware that problems might arise, and made regular backups but it still turned out that all the files were corrupted. Is there a way to fix this? It is a band score and I spent so long working on it :(

I edited this on Musescore 4, tried the RepairAssistant plugin, attempted to decompress and open it in Musescore 3, still no luck.

Thank you very much!