I find it quite bothering in Grizzleheim because the EXP you get is a very small amount; I believe you get more EXP in Krokatopia than Grizzleheim, and that world is meant for level 58's and some point.
All I'm asking is if anybody can increase the Grizzleheim Experience.
Grizzleheim isn't meant for level 58s. The areas are unlocked at levels 20, 25, 30 and 40. When you get to Wintertusk, the experience will be equal to Celestia's experience or more.
Grizzleheim is a bit of an exp pain. But when you get to lvl 50+ and beat it, you get Wintertusk, which gives you exp at around 6k-14k with most quests.