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On page optimization is only one factor of achieving the organic results you are looking for.  The next thing I would ask is how authoritative the domain and individual pages are from a link perspective.  If you haven't run the OSE tool on your home page and individual stock pages you wish to rank then do that, because that will tell you how strong or weak your website is from a link perspective.  You'll want to look into a link building strategy and will work best for your business/website.  On page optimization can set the foundation for your SEO strategy but links is what will give you the lift.