What I’d love is more open world, larger world and way more story.
I’d love quests to be completely re-designed. Put less of them in game, but make their story amazing. Make it like Witcher style, have NPCs that give you quests have mini stories, make quests have impact, make it interest you to actually do them.
Another thing I’d love is definitely way more story around everything.
At the moment we’re just these mindless thralls doing bidding for main NPC characters and never once being mentioned anywhere in lore. We are practically here just to push the NPC story forward, nothing that will ever impact WoW story; heck we’re never mentioned in a single book or lore, it’s always “Alliance/Horde” saved the day, or hey, Jaina did it, or Anduin!
Less of ‘big bad nasty threats’ and more interesting ‘simplified’ villains that don’t threaten to destroy the world. Make it so we face these ‘simple’ dangers, make it so WE are also shown as vulnerable too; how about something where we fail badly? How about we end up caught by the enemy and look for ways to escape and survive?
Story is of huge importance. Playing a game for me means exploring the world, experiencing the story and feeling with the story. I never feel connected to WoW’s world because it never acknowledges you as even being there. You practically don’t exist in it.
Expand open world some more, add secrets, hardly reachable locations, make it so the zones aren’t cluttered with enemies, make the world feel more alive with some mini events. Make the ‘old world’ feel alive, remake it again.
Give us more customization options, I still can’t believe how little some races got and I’m still seeing 100000 duplicates of myself.
Make it so dungeons are actually dungeons, a place you can get lost in, heck even show fear. Enough of e-sports nonsense and ‘go go go’ mentality. How about we work on rebuilding that 'World" in World of Warcraft?
Less instanced content (but enough for those who enjoy it), and give us more in terms of story and open WORLD. Give us, the players, choices in quest/stories, let us pursue a path of our own.
That’s what I’d love to see if we started over.