$BTC do not trade much; as far as I am concerned, I prefer to navigate the technical nuances of these crypto coins. However, if we talk about trading, a general rule is to buy when a coin's price drops and sell when it rises. We can determine some factors that dictate when this will rise or fall by looking at its chart. What is its RSI? What is the support? What is the resistance? Has it broken through both? We can find out by looking at the chart. All this is fine, but the important thing is that whether the price rises or falls, we should not panic. We buy this coin based on its technical values and its strength, right? If that is the case, why should we panic? Patience is what is needed. All the best.