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.