It would be great if we got an Ambitions-themed GP somewhere down the line. A pack consisting of only new active careers.
Some careers I would enjoy playing with:
9-1-1 Career Branch- pick from being an EMT which would branch into the doctor career. Our sims could be called to save a life to get them to the hospital in enough time. Or be a police officer stopping crime by stopping break-ins and vandals. Police officers would eventually branch into the Detective career. Or become a Firefighter and help save lives from burning buildings or save a cat from a tree. Of course NPCs like Police Officers, Burglars and Firefighters returned.
Governing Career Branch- our sims could be part of the City Council and help govern special programs each world offers which could build our sim's reputation up to becoming the Mayor of given world they reside in where our sims could make new changes to the neighborhoods which resulting in positive or negative reactions like riots, pollution, higher bill rates, which would ultimately drive residents out; or start programs like green energy, higher wages, lower bill costs, new activities offered, which brought more sims to live in given world.
Design Career Branch- our sims could draw up blueprints of homes and businesses and make a profit and watch as our builds populate throughout the worlds as an Architect. Sims could also branch off and become a Realtor, showing off homes to potential home owners. Or become a Designer and redecorate sims homes for a profit.
Stylist Career Branch- Sims can open their own beauty salon where they can give NPC sims makeovers with makeup applications, new hairstyles and colors, or send them over to the Ink Studio where they can get new tattoos and facial piercings. Or sims can become a fashion designer and create "Collections", hire models, and take them to the catwalk to show off their styles to audiences.