Content is the king - In the blogging world so diverse and big, you need to establish yourself with a distinction. the only road to it is good, original and valuable content. Be creative, different and surprise your readers once in a while.
Follow up on comments you wrote on posts. Continue the conversation. Bloggers enjoy engaging with their readers.
Respond with personalised comments rather than a generic Thank You. Fostering a conversation helps build the credibility of your blog!