Not a good idea. The only thing you could try is renaming your .old save and deleting the current one.

I would make a copy of the Valheim game save folder first, before I'd try that. I also would recommend making backups of all your personal data from now on, to avoid situations like that.

You should've just learned to live with it and to get your stuff back. I've been killed by wolves before I was ready as well. I shrugged, picked myself up and moved on.