To what i think on my own view i don't know if i can get more knowledge and understanding to this.
You just have to understand the market, you need to be able to study and know when it’s a right time for you to invest and withdraw your crypto currency. And also remember only invest money you know you can make back even if you lose the money.
If there was actually a way you could trade cryptocurrency by not losing money, I bet you everybody will be a crypto trader today. But such is impossible which is why trading is a high demand skill that requires much learning, critical thinking and ones ability to analyze chart to predict possible outcomes, even thou at times not 100% correct. So as for the O.P, if you want to be a good crypto trader you just have to first learn to understand the basics of trading, read good trading books, physical or online trading classes, so that even if you lose a trade, it won't be that much because you already knows the basis