Understanding the trend of market is one of the important thing in crypto trading, we have to enter in to this market when bullish trend only. Use risk management is second important thing, we have to use stop loss and trailling stop for each trade.
But we could also enter the market when the price is down because that will be our chance to buy any coins at a low price. After that, we don't have to do anything because we only need to wait for the price to increase higher so we can sell and make the profit. That could be a way to minimize the losses in trading, but there will be no guarantee to see the price will increase after we bought.