How do Bitcoin traders know when it's the best moment to sell and then buy again?
How to get that moment just before the crash?
How do experienced traders keep holding and predict the best sell time just before the crash?
most people think and say the best time to sell is on top and best time to buy is at the bottom. and this is the obvious answer but this is impossible as you have already found out.
what you do in real life is that you buy at a price that you think is around the bottom or think it is before the rise. and then set a profit amount in your mind. for example you set 3%-5% in mind depending on what you trade and then when you reach that profit you sell instead of waiting around. and when price falls 3% you buy back and so on.