If you can handle Celestia at level 44 - great! However, I'd like to inform you on a little bit of history. When I joined, you had to be level 48 or higher in order to enter Celestia. Obviously, that has since changed.
Even then, I would recommend doing side quests to raise your level. Before I got Forest Lord, I struggled immensely in Celestia on my life wizard. If you are asking if you are too low of a level, I'd assume you are struggling, too. You don't get Forest Lord until level 58, so if you think it would help you, definitely do side quests. Doing Wintertusk (it's part of Grizzleheim) will help you level faster because of how much exp it gives.
so was I, I somehow got to Celestia Level 42 after dragonspyre I did all of my Grizzlehiem now i'm on Defeat Nali in Austrilund at level 49 i'm going to level one more time to be level 50 then i'm going try and attempt again at fighting through