It's nice that you shared your wizard's name, but that is the least important detail. What we really need to know in order to help you is, where are you currently questing.
Which world and area are you in right now?
What quests do you currently have listed?
It's possible you are hitting a level restriction, for example. But we can't figure out what the problem is unless you give us a lot more information.
Oh no! Do you recall anything about your last quest? Maybe a general idea of where it is? If you remember a general area then you could always use the "quest tracker" in the questing/tasks menu.
If you have no idea then go to the current world you're on and go to your most recent unlocked area to the least recent unlocked idea. (Make sure your have quest finder on!)
Hope this helps! If you still can't find it then just contact KI for them to assist you.