Investing with the dollar cost average strategy is pretty wise, but I doubt if Bitcoin will drop below $40k again. The price of Bitcoin lately and also with people's speculation, Bitcoin is already heading to the bull market and might not drop $40k. Just in the month, the price has spiked to $47k, and the next price it will hit is $50k, which might even happen before the end of this month.
For those who are yet to invest because they believe that the price might get to $30k again, don't be reluctant to use the DCA strategy to start accumulating gradually. Even while you wait for the dip, you can start buying gradually.