Consider facebook, twitter, instagram, linkedin, g+. Do marketing in this social media sites. Join groups or fan page that are related to your niche and have great number of audience, make a catchy post like adding images and videos that can entice audience to click on your site, post/comment on the post that have lots of social shares and likes; create hashtags that can catch attention that visitors can click, get more followers, follows other also that are related to your site niche. This are some of the ideas that can help you.