If you think your group is doing well and the hordes of mobs you are killing are way too easy, try „/challenge“. It toggles the challenge mode which can only be enabled if you are grouped. It works on monsters Level 10+ and they have to be at least orange to the highest player in the group. In challenge mode CC duration is reduced, mobs are stronger, mobs are faster, and have a chance to critical hit you. As reward you will get better and more drops and the XP penalty per groupmember is reduced aka you will get better XP.