I agree writing about what interests you and you are knowledgable is best.
SO many people just write about whats trendy - on here its crypto - and alot of them dont know enough to be writing about this, or arent genuinly interested.
For me I love music, memes, and technology so just mainly blog about those.
Also the more people that post about something the harder it is to stand out!
Exactly @conrad if everybody posts about the same thing, how are you making sure you stand out? What is different about your posts compared to others? Whereas if you talk from true passion the difference is that you yourself add that sparkle ;)