The Spring 2022 Update introduced the Level Locking feature, which stores any earned Experience until you decide to unlock your level. While this feature was mainly presented as a tool for PvP Players who did not want to exit the League they were in, the feature had also been presented as an additional challenge for PvE players. To directly quote the update notes,
"Although this feature was created to address a specific problem for PvP players, other players could use it if they are looking for a more challenging PvE experience! How far along the Spiral can you travel as a Level 50 Wizard?"
However, 2nd Arc Worlds and beyond still have level requirements! A Level 50 wizard has no way to progress the story past Celestia. I would love if this could be addressed, as I'm sure many others have been since the update was released about a year ago.