Make sure you are interacting with your readers! If you are not doing so, your are not blogging.
Add your personality - If you are writing on a particular topic, there are a number of people who will be writing on the same topic. So you need to add that specialty to your blog to make it look different and to allow your readers to take away something that the others are not offering.
Follow up on comments you wrote on posts. Continue the conversation. Bloggers enjoy engaging with their readers.