Furniture doesn't move very well.
This is in part because people only need so much furniture, and not everyone has a house / apartment.
But also it can get expensive to furnish a whole place, so many people cut costs by crafting what they want themselves.

I'm no expert when it comes to getting *fast* sales, but maybe try selling something related to the new content. Right now there are a lot of shiny new things distracting people from housing.