Your monthly income depends on a specific period of time. Even if your monthly income is low, if you can create a budget from there, you can plan your investment. Even if your income is low, investing in stages will yield good results. Whether your income is low or high, you must have an interest in investing. You can invest if you understand your income and spend it wisely. The price of Bitcoin always fluctuates. People are hired with the hope of profit.
Investing in Bitcoin does not depend on income. If someone wants to invest in Bitcoin properly, there are some things that must be in it. He must have a basic understanding of Bitcoin, he must have desire and patience, and he must have discretionary income. Let's say a person's income is very high but after his own and family's expenses, he does not have much money left. This means that he does not have discretionary income, so it would not be right for him to invest in Bitcoin. On the other hand, if a person earns very little money but it turns out that after spending all his expenses, he has some money left at the end of the day, then he can invest with that money. Whether the discretionary income can be more or less will depend on the person's income and expenses. If it is less, he will invest with a small amount of money following DCA and if it is more, he will start investing with more money according to his position. However, he must invest with discretionary income. This will allow him to continue his investment activities for a long time and the possibility of making profits in the future will be much higher.
To be a successful Bitcoin investor you need to understand financial management and have a discretionary fund, this are the two things that you need to succeed in it's long term investment. No doubt DCA method is the best strategy to remain focused in buying and hodl for atleast between 4 to 10 years. Remove basic expenses from your income, push the rest into your discretionary funds account and work out a budget that will take care of the funds in it. Make buying Bitcoin a priority from your discretionary funds and be disciplined to always buy when money drops into it no matter what current price is.