I agree with this, if there is a plan and discipline, long-term investment is possible and can be sustainable even with fixed income. If someone's monthly income is $500, he can invest at least $20-$30 after covering all expenses. In the DCA method, no matter what the price, if he continues to invest a certain amount regularly for five years, it will turn into a large number. Which is possible only through fixed income. There are many investors who have started with small amounts and have been successful consistently. The key to investing is discipline and consistency. If you start with a very small portion of fixed income, it will turn into a significant asset over time.
Only an investor with a fixed income can invest in Bitcoin.
An investor must have a discretionary income to invest in Bitcoin.
Without discretionary income, if an investor invests with the income that meets his basic needs or with the emergency fund or the money provided in the emergency fund, that investment will not be sustainable because he will need money for various needs and he will be forced to sell the Bitcoins kept in his portfolio to meet the shortfall in that money.
Therefore, for investment, a discretionary income is needed that will come after a person's basic needs are met.
When a person invests in Bitcoin after meeting his basic needs and emergency fund, his portfolio will be much more sustainable.
The main thing is that to sustain an investment in the long term, you need to do everything you need to do, such as income and financial management, and you need to take all the necessary measures to keep the investment safe in the long term. That is, the main thing here is that you have to hold it for the long term, and for this you have to invest with the amount of money you are ready to lose, that is, you have to invest with money that you do not need, that is, you have to decide to invest from discretionary income. But If you don't have discretionary income, you should not go into investment, because the success of Bitcoin investment is most likely to come only in the long term.