Ok, if you have cloud saves activated, potential world recovery should be something as follow (as per the Bugs and Technical Issues forum):

Download the backup files from cloud storage . You have to be signed into steam in your browser.
Look for Valheim, look to the right, and click the 'show files' button.
Look for a database (.db) and .fwl file that includes "backup" in the name and download them.

Should be formatted something like this (mines gonna show different dates/times):
"IronGate/Valheim/worlds/Myworld_backup_20220627-195041.fwl"
&
"IronGate/Valheim/worlds/Myworld_backup_20220627-195041.db".

In windows file explorer go to "C:\Users\"your name here"\AppData\LocalLow\IronGate\Valheim". You should find worlds folders; 'worlds' & 'worlds_local' make a copy of these folders and save them somewhere like your desktop or whatever just to be safe and have a backup in case things go awry.
Delete your worlds files in both world folders (not the copy you just made). Just delete the files for the world you're trying to restore, leave other ones you may have alone. Do this for both worlds folders.
Take those .db and .fwl files you downloaded and rename them to whatever your worlds name is but be sure they remain a .db file and a .fwl file and paste them into both of those 'worlds' folders you found here: "C:\Users\"your name here"\AppData\LocalLow\IronGate\Valheim"
Then hold onto your butt and start the game. You should have everything back.