I don't think Bitcoin's strong vertical rise to 40,000 $ is sustainable. I expect it to crash down, possibly to 20,000 $. It's a roller-coaster ride for the pyramidal scheme, anyway. People just don't understand. It's a pyramidal madness and more and more are entering the game, but it's economically unsustainable, unless Bitcoin becomes widely used/accepted. But, as it usually happens, gold is going to pick up where Bitcoin takes the dip. We'll probably see 3,000 $ gold in 2021-2022.