A couple things to keep in mind when selling some land...
1. Like @Alwin Alcott mentioned, you need to be a bit patient. While it is very convenient for land to sell quickly, it is not always the case.
2. A helpful tip is to take time to name the parcel with a simple description of the land, and describe it in the About Land tab that way when people are land shopping it will catch their attention.
3. If your piece of land doesn't have the best view, or odd terrain, sometimes it can help to setup some very simple landscaping to help level it out/clean up the view that way the b