Bitcoin had experienced a huge fluctuation in the current crypto market and in my assumption, this fluctuations are merely just temporary for it will recover soon. The best approach for most of the people holding their btc's is to hodl while market is down and buy more btc during dips since there will be time for it to make a recovery soon. This strategy seems to be very effective as veterans of the crypto market were doing such moves and later gain good and generous profit later when market had fully recovered.
I think It's as simple as that big amount of time till sometime when it is not and that's when all their previous gains will be removed.
You make it sound very simple, anyone with half a brain can learn about resistance levels, movements and patterns but that will not make them a successful trader.