I found a bug in my game, was going to upload a fixed version but I didn't realize you couldn't upload updates until after I deleted the old upload. Is there anyway I can restore it?

Unfortunately no, that's just how this system works. Itch does warn you about this on the edit game page.

I recommend using the itch app or butler to update your games in the future. You don't have to delete files when uploading bugfixes and patches, so this is much less likely to be a problem.