Recently, many people have been reviewing their investment returns for 2025. I found that 90% of losses are not due to choosing the wrong coins; what defeats them is the fluctuation of unrealized gains and losses and herd mentality. Are you like this too? Using 1000U to buy two coins, 500U each, with A dropping 20% and B rising 20%, when in urgent need of money, do you sell B to lock in profits or hold on to A and dare not cut losses?