If we could answer your question as to how to sell quilts, we'd all be rich.
I'm sure price, design, workmanship, all enter into the equation. Also the quality of the pictures, the wording of the ad. I don't sell on etsy, but when I go there to look for something I'm overwhelmed by how many shops come up. Surely getting your shop to appear near the top in a search for your items must be important in getting sales.