Wizards 101 needs more quests that are a part of the core worlds (Wizard city, Krokitopia, Marleybone, Mooshu, and Dragonspyre). The usage of the npc characters sending the wizard on quests to help with a particular problem or to attend that worlds version of Ravenwood.
I believe this would make the game more playable and keep players busy between new worlds.
Expand the holiday quests to include other worlds.