Investing in bitcoin has no compulsory amount to invest, the thing is understanding, acknowledgeable, and patience, when you have  the understanding to invest, you receive a huge profit. And the best time of buying bitcoin is the time when the bear is still down so that when the price rises up to your satisfaction then you market it out and make your profit from it. That is why it is called investment. In the bitcoin holding world patient is the answer. You can buy and hold, buy in lesser and hold it for long-term, or wait for BTC to achieve its ATH again? That is the best time to sell it. the DCA pattern is one of the strategies that people can apply, this is directly related to some people who don't have big capital to buy.