1. It’s Not About You – It’s About Helping THEM.
Who’s “them”? the people who’ll hire you. Think about the people for whom you want to write.
Let’s say it’s business people in your area. You could call them, and tell them that you’re a writer. If you make enough calls, you’ll get hired. (See my article on “ratio thinking.”) However, that takes time, and once you’ve made a call you need to follow up. If you mention a business on your blog however, that blog post stays live forever. When the people you’ve mentioned Google themselves, they’ll find your blog post.
More to the point, you can send the businesses you’ve mentioned an email message or a tweet – “mentioned you in a blog post”; add the link.
Few writers make as much use of their blog as they could.