New jobs, more levels/skills, more areas, medicine would be cool, and a larger hub would also be nice. Essentially, everything but wigs. More wigs is unnecessary.
I'd honestly take any of these aside from purchasable medicine, I feel like most of these would be kinda uninteresting without a new area to have them in though. My dream scenario would be a full DLC/update area where your level cap is expanded, you get access to some new jobs just like in the main story, there're a few new enemies/bosses/quest objectives etc.
Overpriced as in with in-game currency being used to buy things over 30,000G? Or overpriced as in irl paid DLC? Because I'll be honest, depending on the amount of content they add I'd rather spend around $15 for a new campaign than an entire new game, Splatoon 2 and Mario + Rabbids have definitely told me that paid DLC can be worth the price.