Simple method is focus on the people. Write anything for the people, such article must help to the people. If you follow this method surely your website get huge traffic and increase SEO.
The content submission in your website, so the On-page Optimization SEO is the best method to optimize a website. If you have high quality content, automatically most of the people refer your link like above someone suggested something freelancefolder webiste. In this way your website promoted. So focus on Onpage and get huge traffic.