The easiest way is: Press F5 then digit: devcommands (cheatcodes mode: True), then digit: removedrops, then digit: devcommands, again (to return to standard mode without cheatcodes active) or the valheim warrior's way: build the biggest boat in valheim put all the useless objects u wanna forget inside ur inventory and the boat (must of them should be dandellions) and enter the boat, go to the middle of the ocean and then just throw all the objects to odin or to feed the monsters that lives in there