If we follow the principle of risk what you can afford to lose, then definitely we will not experience more losses
Unfortunately most beginners of crypto trading are never aware of what is risk management. This is the reason after some frustration in crypto trading, they start thinking about quitting. In my opinion, if you are not ready to learn first then you should never think about getting into crypto trading.
Losses might look like the end of it or you doing it wrong but thats where the real lesson comes from, just dont give up nobody starts off as a pro, practice makes perfect.
Honestly losses are just part of day to day life of cryptocurrency trading and whenever people decide to stop at losses then they might be assumed to be not fitting for trading at first hand. Like you have mentioned we should learn from our own mistake so that we will not repeat them which must be the only practical way to avoid losses so that we will never think about quitting.