If you own the pack, you can progress through the career to unlock exclusive rewards: The Sims 4 Careers: Interior Decorator - EA Help
You can unlock advanced design capabilities and luxury lots for free using built-in game mechanics: The Sims 4 Dream Home Decorator free
: Use the cheat bb.showliveeditobjects to access thousands of environmental "DEBUG" items—like trees, cars, and world decor—to decorate your lot for $0. If you own the pack, you can progress