...Then just invest on Bitcoin money that you don’t have special allocation on it so that you will keep your finances normal even if a financial problem arise. As already pointed out by JJG, people frequently invest all their money for the sake of profit even though it’s allocated for something important.
A salary earner who invests all their money into Bitcoin for the sake of profits is not a real investor, the person is a trader trying to double his income with the idea of Bitcoin investment but it's a wrong move that would backfire since Bitcoin is a long-term investment opportunity, I mean that the person would be forced to sell at some point especially if he's one who earns on a monthly basis. There's a reason why Bitcoin investment is best done with discretionary funds, cause at that point you've already separated the funds meant to essential expenses from that meant for investment, but going in to the market with all his salary for the month especially if he's yet to meet his target or invest for a decade or atleast one complete circle, would force him to withdraw from his portfolio to solve his essential needs.
And it doesn't take long for him to panic when the market drops sharply. That will make him sell his Bitcoin and think about buying at a low price after the decline is over. And investment should be separate from funds for other purposes so that it will not cause financial difficulties for you in that month or in the coming months. So using all the money for any investment even savings is not a good idea because after all, he must be able to meet all his living needs. This requires an understanding of how to start investing. JJG has shown us how and we can use it or modify it according to our circumstances. We use DCA in investing but the amount of money must be different.