try to invest some money in advertising (online), decide what will be the target of people you want to register on your website - then focus on selecting some keywords and improve your google search position for those words.. and change the layout colors, is proven that people prefer brighter templates.. read all you get about web design philosophy, branding, social networks etc... is good to know your "environment" to "survive"... if you have more money hire a professional web see more designer to do all this..