Simple way to incrase backlink from blog commenting if you interested to incrase backlink than must comment on your niche sites. So it's very helpful method.

Do blog commenting regularly. Profile Creation sites also helps to give back link to the homepage.
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use forums

you can create satellite sites ( blogspot, wordpress) , post on the forums...

You are actually doing it now. But spamming around will not give any value to your site. :)

You want more backlinks than do some seo activity for your website like
1. Directory Submission
2. Profile Creation
3. Blog Commenting
4. Forum (With Signature)
5. Content Post etc.

As you are getting it here.

Creates sites on social sites like Facebook,twitter,Google plus,linkedin etc. Blog commenting and social bookmarking is the best way to get back links.