What is your webhost hosting? If you are hosted alongside spammers, pornography or other such questionable material then it could be detrimental to your website. Among other things you could become blacklisted, or even potentially have materials appear on your site because they are being hosted nearby.

Is your website's title making the most use of the characters available? Is it utilizing words and phrases that you have chosen to associate with your website?

What does your site's layout design say about your business? Are you operating within a run down shack on the internet, or are you properly portraying the professionalism and prowess of your business or organization?

Is your site functioning as intended? Do you have any functionality that is broken or distracting that might turn users away?

Is your content fresh and interesting? Could you be making better use of your content space? What is your content saying about you?

Are you getting maximum exposure to search engines? What are you broadcasting to the search engine spiders that are crawling your site?