If you want to be famous or reach a wide audience, you will have to choose something slightly broader and work hard to make the best content for that topic. A subtopic relating to fitness, finance, or relationship advice is likely to reach the most people. Consider specific but broadly applicable topics such as managing money in college, or a marriage counseling blog.
Disclosure and quick heads up – I started my first blog on Bluehost and have now partnered with them to get you a big discount rate. If you make a purchase through this or any of the links on this post I’ll earn a small commission at no extra cost to you. I still think a self-hosted WordPress blog is the best way to start a successful blog and build a business!