You rank for a lot of good keywords but you can rank for a lot more and most importantly, rank higher!
The way forward after some keyword research is to optimise your pages with better Meta Data, Header Tags and Image Alt Tags. In many cases, these don't exist on your pages or they are duplicated. Your pages also would need to be re-written slightly to be compatible with these changes. You need to go through the entire on-page SEO process.
This is something we can do for you if you want.
Following the initial work, we can help you with ongoing SEO and most importantly with your Off-Page SEO building contextual links back to your site.