Any YouTube topic recommendation?

Wanna start my own video blog on YouTube, but have not decided the topic yet. I have few options in mind:

educational (helping students with their applications for studying abroad).

cryptocurrencies (making videos about cryptos, telling people how it works, how they can mine, etc.)

book tube (since I am reading a lot of literature, I thought maybe I should start my vlog about books, tell people what I read, which books I find interesting, etc.).

What would you suggest, or what would you…

Any YouTube topic recommendation?