Give Celestia a try. It might be you will do well there despite your low level and, if that's the case, there's no reason to worry. On the other hand, if you find yourself being defeated often then that's a sign that you should level up some more by doing side quests.
As for those side quests, be sure that you didn't skip any that lead to future spells or dungeons. Always complete any quest given to you by your school professor and by Zeke, as they lead directly to school pets, spells and/or training points for spells.
Doing the side worlds of Grizzleheim and Wintertusk lead to many utility spells and pets at levels 55 and above. Doing Wysteria leads to a dungeon called Tower of the Helephant.
I, personally, think that you would want to level up a bit (especially to get better gear) because you will definitely need it in Celestia. That is the first world where Critical and Block are introduced as well as the Astral School spells that you will probably want to invest a few training points in. Mostly the Sun (Strong, Tough, Giant, Monstrous, Gargantuan (for spell strength) & Keen Eyes, Sniper, Extraordinary, etc (for accuracy)) & Star (Amplify, Fortify, Vengeance, Empowerment, etc). Even the mobs are tougher.
I would suggest starting on Grizzleheim if you haven't that way once you are high enough you will have unlocked Wintertusk. WT is a GREAT side world full of loads of experience, lots of gear that can be useful until you can do WaterWorks at level 60, plus the items sell for tons of gold! Not to mention, you will want to be able to have access to the areas of WT when it comes time to get your spells and school pet :)
I think most people get started on the second arc (celestia) at level 50 minimum.
In the crown shop you will see a lvl50 potion for sale. It will boost you all the way to Celestia. So even KI workers suggest that you need to be at lvl 50.
I think Star Edward guessed your wizarding school based on the Death Symbol you are using as an avatar. Since you didn't specify what school your wizard was from in your original post, I'm sure it was just a harmless assumption. An honest mistake I'm sure.
Actually, OP did specify "life" wizard in their original post. The word wasn't capitalized however and didn't stand out.
"I beat Dragonspire as a life wizard at level 44."
At level 48 Life wizards will get the Rebirth spell, which is a heal-all and won't help them in solo questing. That's why I didn't automatically urge the OP to level higher, because they might have enough skill to make it already with the tools they have and Rebirth is not going to make their questing any easier.
If Celestia ends up being too much of a challenge, however, then falling back to finish side quests becomes the obvious choice and OP will probably figure it out for themselves if they need to do that or not.