From your point of view about bitcoin investment, it is not supposed to be so. Because if you are investing so that when you get broke, you can go back to sell some part of your investment, it shows that you will not grow fast and you might run at loss, because you will be forced to sell when it is not your will. This also show that you are not prepared to set a good strategy in which you can use to accumulate and hodli for long. It is better that you don't buy aggressively or use majority of your incomne to DCA, because you will end up selling at the wrong price and you will definitely regret it. The amount of bitcoin that is sold can't be recovered easily, and this pattern isn't a good way to hodli, because hodlers don't sell their bitcoin but only plan to hodli for a long period of time. The DCA method is used to increase our bitcoin portfolio regularly, and that is why you should only use the amount that wouldn't affect your emergency needs and daily needs to invest in bitcoin, so that you don't go back to sell.