Broken links irritate visitors and can badly affect your ranking. Check and repair all such links on your blog.
Follow up on comments you wrote on posts. Continue the conversation. Bloggers enjoy engaging with their readers.
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.