Corrupt save file

I just received the “Your save file is corrupt and could not be read by the game, continuing will overwrite the save. “ what do I need to do before I overwrite and uninstall this game and request my refund for purchased content? Save me the copy and paste response of repairing the game and clearing the cache because I’ve done after reading another thread about it? This is the only game my son and I play together but this will absolutely send us to another game if this can’t be fixed