These are just every person his thoughts about it, as simple I have a brother who is good at trading and he always does day trading and also in coins like BTC or Ethereum he has been holding it for a long term and he has the ability and the will power to hold coins even for 1 years and more than that if needs. He always says that when the Bitcoin price is up then the dollar price will decrease. But I don't know under which areas he is correct enough on these things and the same things happen too many times.
When I saw the dollar price it was up due to the fall in bitcoin, where bitcoin was about $20k. But how he is managing it, I don't know the reason. Under what circumstances did he have this idea? I had also asked him many times but he didn't tell me yet.