Commenting on blogs is a strategy that is well worth your time. You'll want to find a few of the top blogs in your niche and leave regular comments on them. You will get a backlink to your website, but–more importantly–you'll get visitors when people click on your website link.
This is great because it can help you get the attention of an authority that is already in the niche (the blog owner), and you may gain some of their traffic, which is highly targeted.
Plus, you can begin to build your outreach program this way – now that the blog owner knows you, and knows that you publish thoughtful comments, he will be much more receptive to your offer when you reach out to him.