There is a moment when bitcoin price insreased a lot and altcoin price just sideaway or fall because some reason. Also, there is a moment when altcoin price increased a lot whereas bitcoin price just sideaway even dump because some reason. As crypto investor you have to know those situation to maximaze your profit also to still comfortable when you are holding the coin.
Usually, in my experience when investing crypto currency if there is a bull run season then we have to focus to choose bitcoin as the main investment place because in some situation when a bull run for bitcoin come then we will see most altcoin price will go dump and sideaway. After the bull run for bitcoin is end and its price just make a sideaway market then we have to prepare for altcoin season. Those situation always happen in crypto market.