promotion of your development site is not referent the promotion of other website. you can promote it like other website. so promote your website on social sites, blogs, press release and article sites all these techniques are best way to promote your product and ran traffic for site.
You can promote your website in social media sites. Or you can do some off page optimization techniques. Off page Optimization includes article submission, blog posting, forum psoting , social bookmarking and classified submission etc
Get more back links from high page rank sites like forums posting, article submission, directory submission, social bookmarking, blog commenting etc. Social media networking sites are helpful you for getting high traffic to your site.
The domain you have is not sort of like books, fashion or similar. Even after being ranked for the top positions for different keywords. It is why the basket value of this domain is quite high than others. Mostly you may get referrals clients. I think targeting long tail keywords may help you out.