Depending on the market value, perhaps, worth considering the creation of a professional brochure, video and other more professional marketing products. Also, cull lists of luxury markets in your area and market to them accordingly. Hold afternoon teas and lunches at the property to showcase to luxury realtors. And, conduct an open house every two weeks on a Sunday for four hours. In time, the effort will pay off. I have built and owned luxury homes for the last 24 years... luxury homes do not sell themselves.