you really need to work on your site. What is it for, why is there no info about the purpose of the site, where is your design? Why should I as a user find any value in your service? What is your service anyway?

Traffic from digg is inherently ephemeral. No stickiness. A few years ago digg traffic was a useful way to launch a site or product. My old firefox extension Cacheout! made the front page and I eventually had 10000 regular users. Nowadays the alpha adopters no longer pay attention to digg as a first mover news source. Digg is increasingly irrelevant. Too much noise, no signal.