Just continue in link building. Try to use your targeted keyword in your forum sig and article resource box.. This will help you to increase the keyword ranking of your site..
go for blog marketing using your targetted keywords and stuff them in your blog in such way that serch engine finds it in correct keyword density. I think if you can do it correctly, you site will be sure in top position of google.
and also use Fresh and Quality content in Your index page because search engines are Always Happy with Quality content.
and try to get some strong back links from social book marking and there is post some articles and Blogs with your website targeted keywords link so sure you will get benifits.