Obviously university ep.
I'd like more careers, more personality traits, a beach resort, more interaction options between sims, more for kids and toddlers to do, more skills as well as careers, more worlds (I don't even care if they're open or not, I just want more lots).
Although new staircases would be nice it's not exactly the most urgent wish, it is just a staircase after all. Even though sims 4 is somewhat lacking in the build mode category, it's not something I'm super concerned about. What I'm mostly concerned about is the lack of gameplay, the lack of interactions, and the lack of personality that would really make the game infinitely better.