@XaniMac
If you use the phone or computer to get the same career as last time, you can use the cheat
careers.promote careername
to promote them one step. So then you can copy that line and paste is in and click enter until you get to your old career level.
For example; if your sim was a Detective it would be careers.promote detective, and if they were a Tech Guru it would be careers.promote techguru.
This list might have all career names with the cheats: http://sims-online.com/sims-4-game-info/sims-4-game-cheats-codes/