what is the best way to get unpaid traffic to my website I have tried everything, blogging, social media?

[Jake]

Search engines have the biggest potential, though something like an ecommerce site that just has catalog pages may not be judged by search engines to be very useful, original quality text content, perhaps how to articles added to an ecommerce site can help get search ranking, at least for the article pages, which would be a click away from the main site.

Here's a Search Engine Optimization guide by an SEO authority, teaching the more legit ways to boost your ranking.
http://www.seomoz.org/beginners-guide-to-seo

Search ranking is very competitive, examine the sites that rank better than yours for a desirable keyword, compare their overall quality, page count and backlinks compared to your site.
opensiteexplorer.org is one example of a backlink reporting tool, some links are 100x more valuable than others, don't expect some wholesale produced robot spam links to do much for ranking.