If people will leave their current jobs just to focus and work with cryptocurrencies, I think they need to work hard to be a successful person or they can also work as developers or as a trader. This is the best thing to do if they want to make the bitcoin as their source of income.
It is not advisable to focus completely on crypto market after leaving your job. Have a day job where you will earn salary income and use your free time to earn cryptos. It will have a balance in your life and also give you a sense of financial security.
I have a day job from where I pay off my mortgage loan and pay for daily expenses. Trading in crypto gives me an extra layer of income which I save to have a better future. I think it is the best approach for me to have balanced and comfortable family life.