Write something useful for your readers. Share a relevant piece of information, an event update or a hack that makes a task simpler
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.
Presentation is as important as good content. Have attractive pictures, fonts, etc. on your blog to hook the reader.