September 7 is a special day, before the bitcoin crash, BTC was officially recognized as legal tender in El Salvador, which may have caused panic among large investors, who may have reported a massive sell-off by coming out first with a wait-and-see attitude, making the drop to more than 42800.
From the overall view of today's cryptocurrency circle, other currencies appeared to rebound with a vengeance, while BTC was in a sideways position, keeping a wait-and-see attitude.
From the 4-hour chart, here to choose the direction; break up to see more, break down to see short