Search Engine Optimization isn't as important as the experts would like you to believe. Most of the on-page optimization dealing with keyword density , H1 tags or alt images contribute very little to SEO.

Whatever the algorithm of the search engines , most of the biggies credit original content and a some good hot links to the site. If your content is good ,chances are some good sites will surely backlink to your site and with that in place , I wouldn't worry about other Search Engine Optimization factors as long as new content keeps getting added.