In fact, many traders determine their target profit level with emotion and do not follow the planned Exit strategy. The reasons vary.
The first: leave the market prematurely. A common reason is to worry about not getting profit, so that the profit obtained is only part of what you should get.
Second: estimating the market will move according to expectations, then the position is held even though the market conditions have changed, so that the profit that should have been obtained will actually be lost