Participate In And/or Create Facebook Groups

You can find your niche market by browsing through Facebook groups. Once you find agroup relating to your niche participate in it and get yourself known to their members by giving value to the group. Make your website URL known.
Soon enough, people will start noticing you and traffic will flock to your website. Alternatively, you can create your own Facebook group as well, so that you have total freedom to do what you want in your group.