One of the biggest mistakes in a bull market is to control emotions. Some people make a logical analysis that they will sell at a certain level, and when they reach that level, they find that all the news in the market is positive and that Bitcoin can reach $150,000 or even $200,000. Then, instead of just making a profit, they wait for those levels until the price correction begins.
Is it a mistake to control your emotions, though?
If a person is in a situation he described, he wouldn't be tempted to hold until the price X, simply due to him having a plan in the first place.
But that's just my point on it.