So, writing a personal blog won’t get you search traffic from Google. Because nobody is Googling what did he eat for lunch, or similar.

Personal diary blogs are among the worst if you want to get search traffic.

Some people would be interested in what you ate for lunch, but most people don’t even know you exist. So, if you won’t target the right keywords, then most people won’t even find your blog.

On the other hand it’s not about content, but rather about distribution and discovery.

Most blogs fail because they lack traffic to be monetized. And you can’t be monetized with a personal diary blog.