how to get money when the bitcoin price drops?
the best way is to buy more, with that you will have more and more bitcoin to be your long-term investment.
Maybe what is meant by OP is when prices decline can traders be able to get profits, even though I have never been sure profits can be obtained when prices decline. When the price really decline then I am sure there will not be traders who can benefit. They will only buy when the price is at the bottom, then they hold for a while and wait for the price to rise slowly.