Trading is risky but everyone can have profit or loss with some trades. Difference between an amateur and a professional trader is in long term of trading. An amateur trader who relies completely on luck factor can not get profit in the long term. The professional trader can get positive net profit in long term of trading because he is very knowledgeable, experienced and disciplined with entry and exit.
Amateur or professional trader, the vital thing to do with trading is to use Stop Loss order or Stop Limit order, to avoid terrible uncontrollable loss with market crash.
Regarding proficiency, of course, each person is different and certainly, as we see, who is always a winner is one who is patient and lasts long-term. If we want to get the best price, wait until the halving is over, while all coins are discarded based on previous history and it is real, and in this condition only large coins and projects that have useful products can survive in the market, in addition to using Stop Loss or Stop Limit orders, investors or traders also prefer to hold fiat and transfer their assets before the price drops sharply.