I would use the map generator website tool to find a good seed, and take your stuff to a new seed (you can easily google the valheim map generator), you can take all your stuff by using a world as a transfer world, basically

- make new world
- build some chests
- login to old world
- grab stuff
- login to transfer world
- stash stuff
- repeat until all your stuff you want is in the transfer world
- create new game world you scoped out with the map generator
- move stuff from transfer world.

this takes advantage of the fact your character is not locked to any world, and the inventory of your character stays with that character.
Yeah its a pain, personally I would just restart as I like the start of the game but I can understand why most wouldn't.
I use the map generator, just to make sure the seed is not too crazy.