I am looking to improve my reach as a blogger and improve the quality of comments received. In addition, I'd like feedback on my blog design. What do you like? What would you change or add?

The blog is located at http://www.schaefersblog.com

Additional Background Info:

Originally I focused on writing about life lessons or hacks, but have recently begun to steer away from that path in hopes of being able to write about my varying interests in fields like military theory, political science, sociology, books, wine, coffee and fitness among other things. 

This obviously makes it more challenging to answer the question: "What is your blog about?"  I know many bloggers say you should focus on one or two things, but I grew bored following that path.  Not having a well-defined niche can be dangerous, but for now it's the path I'd like to take. 

Final bonus question:

How do I write about a wide variety of subjects without losing my readers in the process?

I look forward to hearing your recommendations!

- Cameron