What do you do when you max out a sims career?

I move my focus to other sims which is usually the kids since i have my sims work and start a family simultaneously. This is not only with careers but with goals in general. Once a sim achieves the goal i set for them, i move to another sim instead of giving them a new goal. There are some cases where i felt like i wanted to keep playing a sim even after that so i just played around with them and did whatever until i felt like moving on.