It's obvious that every bod id telling you to build backlinks. The how is the tricky part. There are many ways to do this. Creating quality content is also a big help as it gives your site authority. This link gives the details on how to create content and get backlinks.
You have to get more backlinks ... for that you have to do blogging , Social bookmarking of blogs/sites ...
Try using a variety of sources, directory submissions, article submissions, blog comments (relevant not spammy ones). google likes to see variation, forum posts are google also if its relevant to your site.
Backlinks do help a lot. Try to build quality backlinks with your primary keywords and you should see the results. If you do posts comment, forums sig, articles submission, and SBM you'll see some difference on your traffics.
Continue do link exchange only high PR and relevant category and start article,directory submission,bookmarking,link exchange,forum posting, blog posting...
I have viewed your site .It is disappointed to see that your site PR is Zero still you have good number of back links and site is well optimized .But do not get disappointed may be in next update your site get high Page Rank.
You have to continue getting backlinks from high pr sites and also do the some social bookmarking submission. I sure in next updation of Google, you will get good page rank. Keep it up.
Just keep building quality back links. Do some more article posting with unique content, directory submissions on some High PR sites, Social Bookmarking, post some articles with your best keywords as Anchor Text on Squidoo or Hubapges ot any other Social Media Sites. It will take some time but surely will increase your website's rank on Google. But do everything in a natural way otherwise spamming can be reported.
Add new content to u r site, write a blog. See as u also know content is king. Adding new content is the only way to get the PR. Thanks
Make high density keyword your site title . Link exchange with thematic & high pr sites. Do blog post,article submission,directory submission &social book marking.