Engage readers with well-researched and creative blog posts. At the end of it ask questions or feedback from them.
Never mess your blog with too much of Adsense ads. It gives a confusing look to the blog.
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.