If it's purely personal as well, I think it helps to focus on the content by treating it as a hobby. Write what you want, post it up, and just keep doing it for yourself.

Eventually you'll start to see that you prefer writing about some topics more than others, and that content might become increasingly specialised as you dive deeper into the topic. Not a bad point to consider spinning it off if you think there's more potential there, or if you believe you've found your niche.

I'm doing this with my own writing (after who knows how many reboots), and I've dabbled with tutorial style posts with heavy code examples, silly experiments, and higher level musings about agile, work in general, as well as my personal experiences with mental health. I've learned that I have the most interest in relating my personal experiences to how we work, whether that's exploring agile or some other methodology, getting into compassion and leadership, or whatever else comes to mind. And every now and then I'll spend most of an evening writing something new. That's my niche.