These are a few things you could put into the game.
How about being able to store Gold in the shared bank/trade gold between Wizards on the same account? While it is understandable to want a level 100 Wizard on an account, one must keep in mind some people would like to explore the game from another viewpoint ( or rather, from the viewpoint of another kind of Wizard ), and as such, those new Wizards may need some gold to help them get off to a good start. However, sending high leveled, high priced items between Wizards using the shared bank can be a headache at times, so how about being able to put Gold into the shared bank? Not only will this allow all Wizards on that account to use that gold, this will also free up your characters wallet ( or whatever they keep Gold in ) so you can collect more, since it IS possible to hit that gold cap.
And how about being able to stitch items using Gold? Everyone knows if you love the look of one item but the stats of another, you can have them stitched to retain one item's appearance but another items stats and bonuses ( The level requirement to use that item DOES carry over, and the stitch cannot be undone, so be careful ). However, getting the crowns to stitch with can be a headache, especially when the Earn Crowns button refuses to cooperate ( which has been a very present problem lately )! How about being able to stitch items for, say, 1000 or 5000 gold or more apiece?
Also, how about being able to expand the maximum capacity of your shared bank? when I made the switch from my Justin Soulhunter character to my Jessica UnicornBlood character, I had to send almost 500 items, which was a HUGE pain because I had to do it 100 items at a time! I'm surprised I didn't give the game a seizure or break something, the amount of times I logged off and on both of those characters. How about being able to spend Gold or Crowns to enhance the bank and shared bank to hold more items?
And how about being able to report people for more then one issue? Instead of a small box for typing what that person did, you should make it so we can pick what they did from a drop-down box ( or several ), then have a somewhat large message box to type what they did with a higher character limit, of perhaps 300 or so? This will allow us to express more in-depth what that person did so they can be dealt with more quickly.
More animations/emotes would be nice too ( though members only or not is up to you ). The emotes we have now are nice, especially the members only ones, but some people feel it's time to expand upon the emotes system. How about some more like the dance ones, where they don't stop until you move in any direction? Some people have wanted to see a Twirl, Flip, Point, Knee-Slap, Faint, and Air Guitar emote, so why not?
That's just a few thing I feel you can add/expand on. The main story of Wizard101 may have ended, but that doesn't mean you can't add more things to make the game better, and worth replaying from Unicorn Way!