No doubt, those who can should make sure they have bought enough Bitcoin so that they can get as much profit as possible once the second phase of the bull run starts in which we don't know how far the price of Bitcoin might go. Though the price of Bitcoin is quite low at the moment, it isn't the best price for buying but since we don't know whether the price will go any lower or not, investors need to start doing DCA from this point to make sure they don't miss this price point.

Since you didn't mention anything in the OP about it, I assume you mean altcoins by junk coins and even though you are right that one shouldn't hold a lot of altcoins, I don't agree that all altcoins are junk but a lot of them can be very profitable during the bull run alongside Bitcoin.