Need video idea suggestion

For a long time I fantasized about starting a casual YouTube channel where I would just rant about something that I'm passionate about/interests me, but by the time i figured out the logistics of actually filming a talking head shot, I realized I don't really know what to talk about.
I really like stuff like disturbing cases or horror media, anything like that. I dig. So I will ask you guys for any creative rabbit holes I could really get into and explain in a video format. I am a fan and inspired by channels like Wendigoon and Parallel Pipes.
Appreciate any and all suggestions.