I'd watch Roberto Blake, he gives many ideas on revenue diversification, but none of it is around YouTube. Maybe merchandise and affiliate sales, but even then it's going to take you a while. Depends on where you live as well. I know employment isn't easy to come by at the moment thanks to covid, so I'd say affiliate marketing and sales. And definitely watch Roberto Blake. There's also a good channel called "affiliate marketing mc" who does lots of stuff based on affiliate marketing, and "wholesale ted"
But YouTube it'self isn't the path to grow money fast.