The dollar cost averaging method dca doesn't even give you an opportunity to buy bitcoin at cheaper price but with it you can be buying little fraction of bitcoin with your discretion income either every weeks or months without considering if the price of bitcoin is high or low, using the dollar cost averaging method doesn't mean you will buy bitcoin very cheap it's not true.
The idea of the DCA strategy is not for investors to buy bitcoin at a low price but to have the opportunity of consistently accumulating bitcoin at any given price when their money is readily available without waiting for any entry point. Even though the DCA strategy doesn't guarantee buying bitcoin at a low price, at some point the DCA strategy gives investors the opportunity to buy bitcoin at a low price if there's a dip, and at that time is when their DCA money is readily available, they can buy bitcoin at a low price with the DCA strategy.