Series of articles - Create a series of articles on your blog if the subject you choose to talk about is an extensive one.
Presentation is as important as good content, Have attractive pictures, fonts etc. on your blog to hook the reader.
Use technology - Social plugins and SEO tools are a great thing to market your blog or a blog post. If you do not know about it, then learn it. It helps you reach out your audience in a better way and also improves the ranking of your blog.