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If your capital is not big enough, it can only be decided by the market.

If you have enough money, you can turn the green arrow with downward MACD into the red arrow with upward MACD by continuing to buy at high price, and then you can continue to sell at low price, so that the red arrow with upward MACD becomes the green arrow with downward MACD.

-Reminder: Be careful that the CSRC will investigate you for "manipulating the market".