Dancer, Filmmaker (rather than just Media Production or Actor), Singer/Non-classical Musician.
More Athletic careers like Figure Skater, Gymnasts, Tennis Player, Baseball, Sports Commentator or something lol idk just for every very broad area of careers in the game, there could be very specific careers within them.
I also would like it if we could just toggle on/off advancement on Sim careers without sacrificing skill building or performance. There are 10 levels to careers and I hardly pay attention to most of them because I get so caught up in needing to get promoted to reach the top. I would like for my Sim to be level 6 of a career because it fits their personality or where they are in their lives at the moment without keeping them from still building the skills required for that career or having an average work performance. Yes, I want my Sim to have high cooking skill, but maybe I want them to be a Sous Chef, but I still want their work performance to be really great because they can be the most excellent Sous Chef in town.