You had to complete your required tasks in Wizard City before you were invited to travel to Krokotopia. You had to complete your required tasks in Krokotopia before you were invited to travel to Marleybone. You had to complete your required tasks in Marleybone before you were invited to travel to MooShu. Do you not think it stands to reason that you must complete your required tasks in MooShu before you are invited to travel to Dragonspyre?
but yeah, it's a long way ahead for you lol. You'll be there in no time if you have fun along the way