After realizing what a ♥♥♥♥ I was being in my last post, I thought I had better try and make it right. So I google translated what you said. You have lost all your stuff and can you get it back? I feel for you, dude. It happens and it sucks. It's possible to recover your stuff but not likely. I'm not any expert on the subject but there have been fairly recent posts on the subject you can look for to get a better answer.

Basically, it boils down to the fact that Valheim only keeps one backup save file. If you have played much at all since your loss your stuff is permanently gone, It is usually recommended that you do not rely on the steam cloud for your saves and that you manually make regular back up copies of your save files.