You may have a blog, and that blog may be full of very interesting content, but it's not serving much of a purpose beyond honing your writing skills and allowing you to get something off your chest if other people aren't reading it.
As with getting visitors or potential customers in any other aspect of your online business, it is going to take some promotion.
There are a ton of directories and search engines specifically catering to blogs, and it is probably in the best interest of your blog's readership to get it listed in as many as possible. Start with us and sumbmit your feed at once, it only takes a couple of seconds.