First, the money you earn must be protected.

After you buy a coin, if the price rises more than 10%, you should start to be cautious. Once the market pulls back to near your entry price, don’t hesitate—sell promptly to lock in profits.
If you are already making a 20% profit, you can set a rule for yourself: keep at least 10% profit before considering selling, unless you are very sure that the coin has reached a temporary high point.
If your profit reaches 30%, it’s best to ensure at least 15% profit.
The benefit of this approach is that even if you don’t perfectly predict the peak, your profits can still accumulate continuously instead of being wiped out after gains. For more volatile coins like BTC, this profit protection strategy is especially necessary.
Second, losses must be cut decisively.
Before entering each trade, you should set a stop-loss level.
If the loss reaches 15% after purchase (the specific percentage can be adjusted based on your risk tolerance), you should exit decisively to prevent further losses.
Many people are reluctant to cut losses, resulting in deeper losses. In fact, if the market rises after you sell, there’s no need to regret—this indicates that your entry point was not ideal. Trading always involves mistakes, and stop-loss is the cost paid for those mistakes.
Third, you can buy back after a decline.
If you sell a coin and it pulls back, but you still believe in its potential, you can buy it back at the original amount when the price drops.
This way, your coin holdings remain unchanged, but you might have extra funds.
If the price doesn’t pull back much after you sell, and you don’t buy back, but then the price rises back to your selling point, you should also decisively re-enter to avoid missing out on further gains.
Although this operation may incur additional fees, it reduces the risk of missing out on market rallies.
Fourth, principles are more important than predictions.
In short-term trading, the most important thing is not always guessing the market correctly, but establishing your own trading discipline:
Quick in and out does not mean blindly frequent trading.