Farm the bosses and sell stuff to build your money for when housing comes out: it is supposed to go to test server THIS month and shortly thereafter to open.
Help others....start a team that helps lower levels through the instance levels.
Get ready for the new world that they said would be out for summer session by building up your friends list...find wizards that work well with you. Since every world gets tougher...you will need them.
Start a new wizard of a different school..the game is a little different for each school.
Make several wizards of one school main: choose a different second school for each and play them through Marleybone. You can always delete the ones you decide you don't like!
Now what do I do?