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Of course, you should not apply the DCA strategy when the price has reached high, since the price can then be adjusted up to 80%. It would be reasonable to make your purchases exactly at the moment when the price has reached the support level and can start an upward movement at any moment.
Professional traders not only have 1 support level, but they quite often have 3-4 support levels to minimize risk. Buying with DCA can help them to enter on the second support level should the price continue to fall below the first support level, so DCA will still be a good one to consider. I would probably recommend they buy the lump sum if the slide has reached the 4th support level, but it wouldn't hurt to stay DCA.