Comment by wdm0006
I think the main point of a personal blog is to write consistently about things you think are neat, and allow the world to find it, assess it, and those who also find those things neat will stick around.
What is neat means different things to different people, for some it may be one nice narrow thing, for some it may be an erratic mix of topics tied together by the tiniest of strings. But what makes personal blogs different than marketing blogs for SEO is the wanton disregard for all things not-neat.