Right now, the best way to powerlevel is to round up elites inside dungeons or strongholds, kill them, then leave or reset the area to farm more elites.
Bosses are not worth very much XP, public events are not worth very much XP, helltides are not worth very much, and so on. The only one that is legitimately great is gathering legions.
The intention seems to be for us to complete dungeons and other objectives, but they aren’t really worth your time if you’re trying to get levels.
Dungeon bosses, world bosses, caches, events, Helltide chests and all other objectives need to award a huge amount of XP so that they are actually worth finishing.
I’d even go so far as to say put a small amount of XP on the event chests and a nice chunk on the mastery chests. I’ve been seeing a lot of people just blitz and ignore the mastery which is insanely annoying. If it was 10x the value of just completing maybe more would push for it.
Recent hotfix adjusted more elite spawns. If the intention is for us to do objectives rather than simply farm elites, please make it worthwhile. Otherwise the community is just going to move to the next place that lets you farm elite packs.