In a situation where a person's necessary expenses is bigger than his or her income or the cash coming in then the person can't go into Bitcoin investment is impossible because at this point he or she has no discretion income, his income is not even enough to settle his necessity such a person can't manage in going into Bitcoin investment because there's no funds for such, however if the situation is the other way round where the person's income or cash coming in is a little bigger than his or her expense that means he or she has a discretionary income and no matter how small it is he can still invest in Bitcoin with it but his or her accumulation journey will be very slow compared to someone who's income or cash coming in is so bigger and larger than his expenses meaning his discretion income will be a very big one.
There are many people who have enough money but they also cannot invest in Bitcoin because they cannot believe in Bitcoin or they do not find future. On the other hand, there are many investors whose monthly income is limited and they do not have the ability to invest a sufficient amount. But they are doing a small amount of money on a weekly or monthly basis by following DCA. That is why I think first you need to understand the importance of Bitcoin. When a person is able to understand about Bitcoin, he will try to keep a small amount of his monthly income in Bitcoin. However, if it is the case that a person cannot save a small amount of money in any way, it will be difficult for him to invest in Bitcoin. Because even if he can hold Bitcoin for a short period , he will fail to hold for long time. Most of the people try to save a little money. If they hold Bitcoin and consider it as savings with the necessary ideas, they will definitely be able to improve their situation in the future.