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.
Make sure you are interacting with your readers! If you are not doing so, your are not blogging.
Respond with personalised comments rather than a generic Thank You. Fostering a conversation helps build the credibility of your blog!