Why is keeping cash in the account the most uncomfortable when the market rises? Over the years of trading, I have found that short positions are not easy. When the market falls, holders of coins feel uncomfortable; When the market rises, people with stablecoins also feel uncomfortable because they are watching others make money every day. I used to think that idle funds were a waste. When BTC rises, hurry up and buy the last bit of cash; If the knockoff continues, I will hate myself for not having enough space. When there is a real sharp decline, my account will be filled with chips, and I will see a cheap price but no bullets. I can only cut meat from the positions that I am most reluctant to sell for cash. Later on, I realized that cash is not "not participating", but a call option without an expiration date. It does not bring floating profits, but gives you the option: you do not have to be forced to sell when the market is out of control, you can take action when there is a wrong kill, and there is also room for adjustment when there is a judgment error. Of course, long-term cash holdings may also miss out on trends. The key is not to always be empty, but to never force yourself to have only one choice at any time. Leave room for your position, and your judgment will not be hijacked by price. The most expensive thing in a bull market is not to go short and rise for a period of time, but to not go short and buy all future opportunities at once. Remember: Cash may seem unprofitable, but it can still give you choices when others are forced to handle positions; The true sense of security in trading is not about a full position increase, but about having room for both advance and retreat.