Contact several webmasters (preferably good, authority blogs in your niche) and offer to write a guest post. Write a really really good article on a subject related to your niche and pitch it to the webmasters. Some blogs will give you some keywords to work on, but most will accept a really good article of your own. You'll get a powerful link from the blog, which is awesome for your backlinking strategy. Just keep doing this every week and, after 10 guest posts, you'll have a great backlinking profile.