Social Bookmarking has value, but you need more than ONLY social bookmarks to your site. You need Article backlinks for one thing. Ezinearticles.com may be the best approach for that right now. If you cannot write. Hire someone. Try Elance.com. Or send me a message. I write for people as time permits.
But even more important to boost your traffic and SERPs will be backlinking services like BacklinkSolutions(whose membership is closed right now) or Linkvana.com. It costs but is easy to use and results are rapid and backlinks come from high quality blogs in their network. Again, you can outsource the writing for this. If you sign up from my link, tell me and I can coach you with the learning process as my bonus.You will find my link at my 1waylinksreview hub.