Starting Bitcoin investment with little capital will be very challenging mostly if that happens to be the major survival option of the investor. And in cases where the investor plans on using the proceed to solve their needs they might end up selling when the price have dropped just to settle the pressing need of that time.
Everybody would have to consider surviving before considering investing. If you know that your earning is not enough for you to save and invest, then just focus on providing your basic needs. Alternatively, you can seek another source of income that will increase your earnings.
As experienced investors are there measures that can be imbibed by new investors with little capital to help boast their capital. Some will want to mention patience which I will agree to but in situations where the money is needed to meet an emergency need how to you tackle such situations. Your formula might be a saving approach.
The first thing is to plan how you want to organize your income, expenditure, and investment. Ensure you budget enough funds for your basic needs and avoid waste. Set aside a portion as emergency funds for unforeseen occurrences. If you still have extra funds, it can be used to buy Bitcoin regardless of how small. If you keep applying the DCA method, you will be surprised at how much you have invested in a few years.