You can use MC Command Center to promote your Sim (From a computer in-game, click Cheats>Career>Promote), OR if you have UI Cheats Extension you can right-click on a job icon in the career panel to promote or demote your Sim, OR the cheat below if you don’t want to complete the objectives. You get 3, yes, 3 separate careers in this pack, converted from The Sims: Castaway Stories.
🏝️The Sims 4: Castaway Stories Career Pack🏝️
