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.
i think they don't need to leave their current jobs just to focus and work with cryptocurrencies, they need to do their real jobs and also in extra time they need to work with cryptocurrencies because many sources of income is much better in advance world and also helpful in investments or in future after retirement.