One source of income is sufficient and enough for an investor to achieve his or her long term goal what is very important is how committed, how consistent, how determined and how devoted and passionate they are towards there Investment. May I also inform you that multiple source of income doesn't guarantee successful investment especially in Bitcoin investment, you can have several sources of income and yet you don't have the above mention and if you don't have it, is as good as waste because you can not do anything meaningful with it. Multiple source of income can only be interesting and sweet if you actually know what to do with it.
Yes, if an investor has a good source of income and if the investor can invest in Bitcoin according to plan, then he will definitely be successful in maintaining his investment for a long time. As an investor, I always try to do this that if necessary, I will invest a relatively small amount of money in Bitcoin, but I should be able to make my investment consistently. If the matter is such that an investor buys Bitcoin with a good amount of money in one month and is not able to buy Bitcoin in the remaining two to three months, then there will be a break in his continuous investment and if there is a break in the middle of any work, then the desire to do that work will no longer be the same as before. Therefore, we have to determine an amount based on how much money we are earning, how much money we are spending monthly and how much money is left, and as much as possible, the investor should invest in Bitcoin continuously for a certain period of time with that specific amount.
If the investor fears that his investment may be irregular, then the investor can form an emergency fund if he wants.
If an investor creates an emergency fund, if they do not have enough money to invest in any given month, they can use the money from that emergency fund but still continue to invest in Bitcoin.