They get steadily harsher with each new level, and you’ll want to tackle the requirements as early as possible to boot your sim up to another pay grade.
Reward Traits purchased through the Rewards Store are especially good for punting a sim up the corporate ladder, though it’ll take a while before you can afford any. A Criminal, by contrast, may want to be a Loner, as their work hours don’t permit a fantastic social life. Going back to the Creativity Aspiration, sims that follow the Entertainer Career will need to develop friendships quickly, in which case you’ll want the Outgoing Trait.