If you want to increase visitors your website then i suggest you to use social networking websites such as:- facebook, twitter, Stumble Upon, Reddit etc. And also do Forum posting, Blog Commenting, Blog Creation etc. this will help you to generate more visitors on website.
The most guaranteed way to get unique visitors is to have good content. Having exposure on social networking sites helps too, but if the content isn't original and good they'll visit once and never come back.