I really like the mythic+ system in WoW. I think infinitely scaling dungeons with unique twists on them would be awesome.

There are also small things that I think would do nicely like a greater presence of world bosses. I’ve only ever fought Odin once and it was really fun collectively taking him down with others.

Gear that has unique effects such as tier gear would definitely spice things up. What if soul eater had a chance to proc an edge of shadow? Cool stuff like that is what makes the game interactive to me.