The easiest way to increase your Google rankings is to increase the size of your website. That's the reason why Wikipedia ranks #1 on Google for so many keywords.
The simplest way to increase the size of your website is to add a blog and post to it as frequently as possible. The more frequently you can post, the faster you will see an increase in rankings and traffic.
Focus on producing the highest quality articles you can for your blog. Educate, inform and entertain... don't sell! Adding value (instead of selling) will result in more links to your website and higher SEO rankings.