Get high quality back links from sites that have a PR rating above 3 and are Authority Sites. I would target edu sites that are discussing subjects relative to content on your site and I would enter into the conversation and in most cases ask permission to comment.
You can submit your website to quality directories! Some of them requier a link back to there page but that doesn't matter when you're. Focussing on the same keyword! Try to start focussing on keyword with less concuration to practice and get number one of that keyword and after reaching that goal you can go for a keyword with a bit more concuration! Cause that way you're PR also get higher!