I think it is very important to have multiple sources of income to invest. Otherwise, the investment will eventually collapse.
With the high level of unemployment, it's difficult to get a multiple source of income for the poor and average. There are other ways of improving your income. You can go learn a course to add to your qualifications for income increase. Some persons with one means of income is financially stronger than some people with multiple sources of income.
If a person has a permanent source of income, then it is more powerful for him, but those who have only one source of income and whose source of income is not really reliable, then they have to find multiple sources of income. Yes, I understand that in developing countries there is a problem of unemployment, so it is difficult to find multiple sources of income there, but suppose a person works and if he thinks a little differently in his spare time along with his job, then extra money can come from there. For example, I have seen many people who run grocery stores in their spare time or run shops selling products on the side of the road at low prices, here as well as they get money from their jobs, they also get profit from this small business and this business can be considered as an alternative source of income.
This is why it's not necessary or important for anyone that wants to start his bitcoin investment to have a multiple source of income because he might not have till he gets old due to the lack of jobs. However, a brand new investor only needs his discretionary income in order to start his bitcoin investment. If your discretionary income is little or isn't stable, you need to look for means of increasing your discretionary income because you have an important need for it which is to put it into bitcoin investment consistently and persistently overtime.
It is not mandatory to have multiple sources of income, but if someone has multiple sources of income, it is a good financial support for him. If an investor invests in the new situation, understanding discretionary income, then it will be the right decision for him and it will be the right decision as long as their income stream continues. Many times it happens that someone loses their job or many people lose their workplace, but they do not have income, as a result of which the investment may stop at that time and if this continues for a few months, the investor may decide to sell the investment later due to financial shortage. So if someone does not have a stable income, then it may not be wrong for him to try to find multiple sources of income, rather it will provide security to his family and his investment.
Also inflation is on the rise overtime, if you don't look for means to increase your income, a time will come that your income wouldn't be able to meet up with your basic needs and monthly expenses which will definitely deprive you from investing in bitcoin at that time.
To keep up with the times, you must have some skills, but those who are not very good in their skills will not be able to increase their income even if they try, but it will be challenging to maintain their current income. Yes, to adapt to the future, you must try to increase your income, you must prepare in advance because the world ahead is going to be more difficult, if you are not prepared, then you will miss investment opportunities and it will be difficult for you to move forward.
Your bitcoin investment wouldn't collapse because you only have one source of income, provided you did not sell those bitcoin you bought with your discretionary income. One source of income doesn't mean that the person discretionary income is very small. Some people has a big income and discretionary income from just one source of income.
People can earn a lot of money from one source of income but they have to go to that position. The first class employees of a country get the highest salary while the tenth or eleventh grade employees of the same country get the lowest salary. And I think it is not a good decision to always sit for a job because times are changing so we have to think about doing something alternative. If we do business or become an entrepreneur then I think it will be better than doing a job but to be a business or entrepreneur you need patience and need proper guidance then only then it is possible to be successful and it is possible to earn more money than employees and at the same time it is possible to invest more money consistently.