So, for reasons unknown, you now work for FFG. Your job? To make the game board BIGGER. Yes, they don't care if you don't like the idea, you have to do it and have to do it good.
You have to add at least 3 big cities more. The rest is up to you, but they all should have logical connections with the rest of the board, so feel free to add some of that too.
It should stay as balanced and fun as possible, otherwise you will be fired and put in jail for killing joy.

I would add, and you can use this, of course, Mexico D.F., Paris and Delhi.
Mexico: recover health.
Paris: Gain Glamour spells.
Delhi: Recover sanity.
Ok, now work while I have lunch, this is FFG, **** it!