I play Valheim with my wife and a few longtime friends I trust. In other words: people who don't suck.

We all know we *can* use the "use character on server, use same in private world, cheat in goods, go back to server...", but none of us are interested in screwing over one another, and we want to play the game without using cheats. In fact, on an older map I used https://valheim-map.world/ but on *this* map we decided against doing that. While we know we can, we simply don't want to.

Find "friends" that don't suck. Play with people who don't suck. That's really your best option, regardless of the game and what possible "exploits" it may have.