After a trend, there is often a callback or shock. People who have made profits from this trend will feel that they are doing well again, and then they will increase their positions and work hard at the end of the market when the shock or callback begins. Then, not only will the profits be lost, but they will even lose money.
People who have not made profits from this trend are anxious about FOMO and are afraid of missing out. They want to get a bite if they chase in, but the end result is that they are left to wash the dishes.