One of the biggest mental barriers that hold people back from creating content is not knowing what to talk about.
If you feel like you have too many interests and can’t decide what to talk about, this is an exercise that helped me.
Grab a journal or word processor - however you prefer to write - and set time every day to write for 30 days. No agenda, not pre-prepared topics, just a brain dump every day for 30 days.
After 30 days read your entries and see which topics you write about most. These are the topics you can keep talking about all day.
These are the topics that give you life, but may be boring for others.
These are the topics that you should create content about, and you already have a number of of journal entries to give you a starting point.