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Unfortunately without knowing anything about your site, it's hard to say whether there are on-page/on-site optimizations that could be made to help improve your rankings. You could try posting your URL on the Google Help Forums to see what type of feedback you get as far as on-page/on-site factors the could be changed to improve your rankings.
The last time I did this on a non-competitive term, on a site that had some OK backlinks, it quickly took the site from page to to the #1 spot for some less competitive terms.
You should also check your title tags and description meta tags while you're at it.