Army, you could have the SIM go away to war or wherever and they could get a bonus for going if they were away for like 10 SIM days or something! you could have like deaths and their partner could receive SIM pension.
interior design same as in Sims 3 you could have architect where people hire you.to build from scratch like houses with certain specifications like certain objects in specific.locations or themes with a set budget.or restaurants, cafe etc
when we get a pet expansion pack you could have a career as a farmer, and build a farm and look after the animals wtf
gardener designer add on to the Sims 3
education, your SIM could have to come home and Mark paperwork, they could have random days off for.holidays like schools have e.g summer holidays etc they could start off as an assistant and to get promoted they have to do courses which builds their skills.
nursery or childcare job
you could have, like a theif/spy job where they get a boss who gives them jobs to do so it could be to steal certain objects from Sims gain information, be friend sims.to gain information