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.
Engage readers with well-researched and creative blog posts. At the end of it ask questions or feedback from them.
Be clear about your goals for blogging. Maintaining a blog is laborious. And your goals will keep you motivate!