Agreed, a professional trader also experiences losses and they can minimize those losses by practicing good risk management and financial management. Diversification is needed in trading and also in investing. We can choose some potential coins. And of course trading requires long experience.
I think those professional traders are human only. So, it is normal if they still can do some mistakes. But because they are professional traders, they must understand well to avoid the mistakes. We can assume they should rarely do mistakes. The professional traders must often get good profits because they know how to set a proper strategy. Yes, professional traders will easily choose proper coins because they must have a great ability on analyzing any crypto coins.
Yeah, no one is perfect, maybe in the beginning, those professional traders struggled as well and losing big amount of money. But it doesn't mean that it will just deter them. Most of the time, it will keep them motivated to keep pushing until they become successful.
Or at least have avoided their early mistakes and now they are a veteran and knows everything, on what to do in order for them to keep on making profits, regardless if it is small or big. The theme here is to continue to grind, day in and day out and make money.