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.
See, this is gonna be one of the major reason why you need to invest what you can afford to lose. We have to understand that the risks of lossing associated with bitcoin is not only when bitcoin magically lost it's value and never recovers.
Before you put your money in bitcoin you should always plan it out on how you're going to diversify your funds for your necessities, investments, savings/emergency funds.
Always remember that bitcoin investment is not an emergency funds because doesn't going to work due to it's high volatility nature.
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.
With little capital it's most likely you're gonna miss the dip if you're trying to save up a certain amount to put it in bitcoin in one piece. It's always advisable to DCA and of course do it during dips or even the sharpest dip if you can possibly find it.