Write about issues which are interesting and stay current on the news front, but dont become a newspaper. Your blog should have contents for all ages and cultures.
Write about all aspects of life, there is nothing which is important and unimportant. Nowadays people have very little time to go into detailed reading. Keep it crisp and short.
Lengthy articles will have its own audience. Don’t cut short just to get an audience. people will follow if your blog is honest and states useful stuff.
Lifestyle articles and food, health, home family anything becomes important. Kids and pets stuff is appreciated as well. But choose your area of interest if you want to write heart felt stuff.
Most important, write often to keep the link going.