Hey,
a thing that I know from Guild Wars 2 and which I always loved: Just some random events that start in some places from time to time which you can just do while passing by and get some crafting mats, buff foods or gear.
This would be a nice thing and also make the world more "vivid".
Kind regards
Wolle
Yeah I'm a GW2 player as well, and the random events were pretty fun to do, much people gathered to help and it was really fun.