A niche means you have the competitor in ASMR, all these video you seen. In Me case, that will be Organic Chemistry, so the competitor would be Khan form Havard

So you define that niche, you meaning the categories of

Education - instructional

Medical

Laws

ASMR

Tourism

Youtuber

You could have business / accountant / CPA / coaches / Small business owners

I am not anywhere outside certain niches? Most are academia? I won't be even headed inside my brain to think of what else exist on the market, you probably meant you making money with.  

Detox

Weight losing program coaches

Fasting and meditation

Religion seminar

Shaman you becoming New Age 2012 money money here you go?