According to me fast trading strategy is fall under panic selling.
People who are in favour of fast trading strategy, they only get small returns on their investments. Because if you want massive gains then you need to hold your investments for long term. Secondly in fast trading strategy you cannot predict the prices. You will face high volatility in fast trading. All these obstacles you will definately face in fast trading.
You are right fast selling often result in loss. Losing money in easy but making money in cryptocurrency in very hard. You will have to make your strategies about your trading. Good and successful traders always focus on the market trend. Right decisions on the right will give you some profit. If you make one wrong decision about selling and buying you may lose your investment.