There are reasons to choose to go long; in the four-hour timeframe, there is another opportunity for aerial refueling, with the target aiming for the previous high of 4010 which may lead to a market move towards 4100! Therefore, when it reaches the bottom support, we should enter long positions, but we must also guard against a strong direct bearish move. Hence, after entering the 3rd layer of positions, a stop loss must be set. We will not add to the 6th layer because the one-hour support level is originally where the 6th layer position is located, and we are entering near the one-hour lifeline, so there is no need to take action on the 6th layer!