If you have a blog that deals with sports cars then find other people that talk about sports cars and comment on their posts. It doesn’r hurt to branch out slightly to related industries as well, for example car parts, car accessories either.
Try to get syndicated

When I write a post it immediately gets sent to Marketing.alltop.com, Socialmedia.alltop,com, and social media today. That’s 3 different places that my post appears in addition to appearing on my blog. This helps increase your reach.

I have my blog URL in my email signature. I also have a link going to my blog from my facebook profile, linkedin page, twitter account, etc. Make sure that you make it easy for people to discover your blog.