When it comes to discipline it is something most people find it very difficult to practice, knowing that trading is about discipline to obtain a successful trade.
Probably, this is the most hard part/ requirement that a trader needs to have in order to stay focused on his goal. Most of the people that trying to become crypto traders are impatient and that makes them prone to wrong decisions. Also, they forget that the money that you put for your trading, can't be touched since is your tool for your trading. Your profit, if any, is different from your trading funds...
of course they cannot know exactly when is a good time to enter or exit the market.
Basically, you always try to buy as much as possible less than what you sold. And there is the trap. Because most of the people entering the crypto market/ trading trying to catch percentages like 15% per trade or even more. For me, these are "crazy" numbers and I think that there is no need for someone who considers himself a trader to chase them.