This may be a bit cheap to do but, your character and all its items can transfer between worlds on Valheim. Meaning you could get a bunch of metals on you in your main world, log out and load in a different world, put all the items you cant carry or cant take through a portal into a chest, then load back into your main world and go to the location you want, load back into the world where you put things in a chest and pick them up, then load back into your main world at the location you last logged out at. It's a bit of a tedious process and kinda an exploit but it works!