That is what happens when the thing that matters to everyone is to get stuff done and fast. The general difficulty got adjusted to the point where people never have a reason to cooperate in the open world, crafting got relegated to the side lines and is usually not worthwhile enough and even then people would rather have alternative characters that do the few dependencies there are instead of relying on someone else. or there is an NPC that solves that issue outright. Then there are the tools that automate finding a group for the things where you absolutely need a group and you bet no one interacts in those groups... Oh no, it's rush to the end cause everyone got different things to do including so many daily quests. No time for even banter.
You want community? Great, slow down the game and see if that helps. Sure you may loose players that way that liked the pure convenience but if players find that they have time they may just start interacting.
Me personally, well I stopped playing MMOs entirely simply because the magic that was community got killed off exactly like that. Why play in an otherwise boring and dead world when the big promise of the genre is to play in a shared world WITH other players.
Indeed that is the case, the way you build community is to make it not fucking optional.
Dungeon finder that gets you into a group and conveniently into that dungeon? Nope, do it yourself by chatting with people and finding a guild, clan, whatever that suits your needs.
Map markers that show you outright where to go and what to do? Nope, figure it out yourself or ask someone who may know.
Allowing crafting to have a good place In the sandbox by making it valuable and requiring several different professions to get to the good stuff? Yes please.
Don't Introduce NPC's that allow you to circumvent the need for other players.
Make it inconvenient to transfer items between your characters on the same account or multiple accounts of the same person. The original mail delay in WoW between characters did exactly that.
Ensure that direct trade is always better than using a big market place.
And that is just off the top of my head. Building good community happens when it's needed and there are consequences for being an ass. Back then you couldn't just find a new group of people on the server you were on. Of you were an ass to everyone you would end up on ignore lists and make your own life so much harder. At the end of the day community only works if there is a need for community.