Sorry that you aren't getting any showings.
My best guess without know more is that possibly the price is not in line with the market in your neighborhood.
Your realtor can show you all the homes for sale in your neighborhood. Look to see that your house is the most attractively priced.
For instance, if there are 14 homes in your neighborhood for sale and your house is selling for the highest price per square foot, then probably buyers won't want to see it.
Also, there are a lot of other things besides comparables that your realtor can do for you regarding exposure on the MLS and the web. Find out what those things are.
3.5% comp to realtors is a great lead in for you. Be sure your realtor has helped you position your house to be the most attractive and BEST buy in the area.