One trader has a 60% win rate but his portfolio is down 6% using a 2/1 risk-reward.
Another trader has a 30% win rate but his portfolio is up 12% using a 1/5 risk-reward.
So, it’s necessary to have very strict rules on risk management that help you to always preserve the capital and not to take crazy risks.
Is a "win rate" really such a thing in crypto trading? From what I know a win rate is something being used by those odd pickers in gambling but not in trading because there is no such thing as a win rate for a trader since the market is to volatile to guarantee such trader being accurate in the market. Risk management is also barely used in the trading lingo but I believ what you are trying to say when risk management is involved is the cutting of losses of a trader to the bare minimum. In your example where the trader have lost 15% of his capital this can be something mitigated or avoided if the trader react way earlier or has a back up plan/ exit strategy when the target price failed to hold, maybe losing only up to 5% is what you will be looking for if you are trying to manage your risk.
Everyone in trading knows that risk management is necessary to prevent losses that can affect your mental health. We all know that when it comes to money, we should make good decisions and execute strategies carefully so that we do not fail when we are having transactions. Always be mindful and aware of the market because that will serve us your basis and also be patient.
In trading, technical analysis will keep you on track about how market moves and your strategies will based on that, by doing that, you should consider the risk the you will take and minimize it as soon as possible.
Minimizing the risk of getting losses in trading will keep you healthy in you trading career so that you can recover easily the money that you've lost. Avoid having a mindset that YOLO in your trading career, that is not applicable in any circumstances most especially if it involves money and cryptocurrency in the market.