It depends on how one likes to play these sorts of games. If your original intent was to kill all the things that needed to be killed, probably worth shelving the game for a while; admittedly a LONG while since the devs aren't fast with updates. If you like a more laid back approach, enjoy playing it with friends, just like to mess around or build, there's a lot more to do.

From a group-play perspective, there are hundreds of community servers you can join, many who create their own custom content and events for the game, do creative roleplay (if that's your bent), and of course the existence of mods helps a great deal. The better monsters and loot mod adds a little spice, etc.

I don't think the devs are stupid at all - this was a personal "what if" project that hit the gaming world at the perfect time. Lots of people at home, a pandemic forcing people to find other ways to entertain themselves and a severe lack of anything creative such as this on the market. At the time this ticked all the boxes. No one, particularly the devs, expected Valheim to take off like it initially did.