How to understand that much is less, and less is much. I have a friend who spent 400,000 yuan when Bitcoin was 400 yuan each, buying 1,000 of them. In 2013, when Bitcoin rose to 8,000 yuan each, he didn't sell because he felt that 8 million yuan wouldn't solve the problem. In 2017, when Bitcoin was 20,000 yuan each, he sold all of it and enjoyed life, believing that the problems in life had been finally solved. And you, with only one Bitcoin, many years later, when Bitcoin rose to 20 million yuan each, sold it.