You may have set or tied the record for lowest level in mooshu friend.
But no matter because I have a few tips for you.
none of these tips will work without this one First do every single, (or) almost every single side quest It helps, it really does and even though it cost a little effort you'll find you'll have boasting rights among your friends when they are further along the questline then you and have a lower level
2nd When I finished KT I was level 25 I went to wysteria and came out exactly level 28 Thats 3 levels for a level you dont even have to do! (also grizzlehiem helps too but more in the long run than what wysteria is)
3rd Do dungeons twice it may seem brutal and I dont mean every dungeon either but the best way to get the extra levels are to do things that arent even originally offered
Really hope this helps btw, you may as well do these cause I believe you have to be level 50 to start celestia thats 2 worlds away and your only halfway there!
You are never too low of a level to be somewhere. But I bet you Mooshu will be 100% easier if you do your side quests. Trust me, they help a lot! You are level 26 now, when you are level 30, or maybe 35, you can buy good gear for your level and your health and mana will grow. Hope this helps!