Change has to be planned, created and implemented. It can't happen overnight by someone snapping their fingers or waving a magic wand.

We already know that something will be coming later this expansion via the Firmament. As frustrating as it is right now, you need to remember that they are working on it.

In the meantime, make use of apartments and FC rooms to temporarily sate the desire to decorate. It's an opportunity to experiment with furniture combinations and placement so you're ready when you do finally get a house.