Some people make the mistake of selling all there Bitcoin just because they want to start a new business or investment with the money and after selling it and the start there new business or investment some time later it crashes and they lose it and also lose their bitcoin investment so keep your Bitcoin investment going while trying out other business or investment.
It's a wrong practice to sell all the bitcoin that you have accumulated over a long period of time to start up a fiat business that's prone to inflation. Infact, I will say that it's one of the dumbest thing for anyone to do because you bitcoin investment alone will generate bigger and bigger profits in future if you keep on holding it and safe yourself the stress of starting up any business due to the compounding effect of your bitcoin portfolio.
I don't think that there's is any business currently, that can give you the percentage of profits that bitcoin can give to you in one circle if you invest into bitcoin with the same amount of money that you use to set up that business. It's good to have many streams of income but don't sell the most profitable one in order to set up a low profitable business all in the name of having many streams of income. I prefer to have only one strong stream of income than two or more which isn't up to my one strong stream of income.
When you have reached your over accumulation stage, you can use the sustainable withdrawal method to tap profit from your bitcoin portfolio because that will keep your bitcoin portfolio in generating more profit because you are with you are withdrawing is very small compared to the compounding value.
Young people generally have to figure out how to earn income in order to be able to invest in bitcoin or anything else (and also to be able to continue to hold onto their bitcoin investment and/or to build it), so sometimes they are left with tough choices in figuring out how to earn income, whether to work for someone else or to engage in some form of their own business that might result in their getting more income than if they had worked for someone else. The answer is not clear and some kinds of businesses are more capital intense than others.
It is not automatic that bitcoin is going to earn more money than figuring out some way to get an income so that expenses can be paid than so that bitcoin can be bought with the excess money. Bitcoin does not generate money in and of itself until it is built up (and even held for a significant time) so that it is large enough to start to be in a place that it can start to be withdrawn from.
Another thing is that guys sometimes get locked into shitty paying jobs, so sometimes they might need to spend some money (and/or time and energies) in order to put themselves in a place to be able to make better money. These are not easy choices, and the answers are not obvious since they likely take some efforts from the involved person and also sometimes based on a variety of preferences and the potential to build on already existing skills and characteristics.