I follow the daily best posts on hacker news hnrss.github.io
This exposes me to quite interesting blogs (mainly tech, but not always). If I find someone worth following, I’ll add their blog to my list as well. That’s how I’ve been building my RSS feeds over the years.
From the non tech blogs that I’ve found there, from the top of my head, these are nice
going-medieval.com - medieval history professor’s blog. She’s quite witty, and makes super interesting posts about the daily lifes of people in the middle ages.
brr.fyi - blog from an IT guy working in a scientific research center in Antarctica.