You are right. If a person has the right knowledge, the right knowledge of the strategy inside him, then he will never be afraid of the market going up and down. Since he has the ability to analyze the market completely, he can analyze it correctly with his maximum knowledge and invest correctly for a short time or a long time. Although he loses some amount of his money, he has the right knowledge and ideas to recover his money. So I think for a professional investor, no matter what the market is like, he will not be afraid of being in the market, but he can continue to invest with his own knowledge.
I think you're missunderstand the concept here, and what did you mean by analyzing the market completely? Seems you're one of those guys that always try to control the market, mind you bitcoin investment is not like that of shitcoin or trading that one will be hoping to get profited within a couple of days/months, in bitcoin investment you will have to make a lot of sacrifices just so that you would be able to HODL your bitcoin in the long run, as a bitcoin investor you don't have to go for short term profit, as this is not the right approach. So you need to ensure that you're going with the right approach to avoid repeating that same mistake that other investors made in the past.