What is that one thing? CONTENT. Content, my friends. As an SEO firm, we operate offices across the country and one thing we can tell you is that people all over love to see good content. Of course, good content doesn't just soothe the soul of humans, it also soothes the souls of the search engines.
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You have to write unique content. This means no copying what other people write. One, that's plagiarism. Two, if you avoid that, it just looks tacky. Do your own research and find out what people want to read and write about that. Write stuff that is not on other sites or other pages of your site. As an SEO company, we can't stress this enough. People hate it. Search engines hate it.
Post new content frequently. Your site should have new content added to it on a regular basis. A site that adds new content is seen as more credible than static sites. Your rankings will see great improvements if you do this. Search engine rankings are sometimes hard to achieve, you want to do all you can to get them!
Need help creating great content? Then contact Integraphix who has a whole team of talented marketing specialists who write specifically for SEO purposes.