Bitcoin is now fluctuating around 75,500, recovering gradually. The bulls' foundation is still stable and hasn't collapsed. The daily chart remains in an upward channel, and the previous overbought conditions have been fully digested. Indicators are gradually strengthening. The support zone at 73,600-73,000 remains the ultimate lifeline for the bulls. The overhead resistance at 76,500-77,500 is heavy with selling pressure, making it unlikely to break through quickly in the short term. The 4-hour chart shows a rebound from lows, with the bears' momentum waning, and prices have regained support levels, slowly recovering in the short term. However, the rebound strength is limited, and resistance at higher levels may cause a pullback. The 1-hour chart shows a narrowing range with bulls and bears tugging, with no clear trend. Only if it stabilizes above 76,000 can there be further upward momentum; falling below 75,000 will lead to testing the 74,000 support line. Today's trading strategy is to buy low and sell high within the 74,000-77,000 range.

Bitcoin (April 21) trading strategy:
1. Short at 77,000-76,400, stop loss above 77,700, target 75,000-74,200
2. Long at 74,000-74,700, stop loss below 73,300, target 76,000-76,800

Ethereum (April 21) trading strategy:
1. Short at 2,360-2,330, stop loss above 2,390, target 2,270-2,250, expecting further decline toward 2,200
2. Long at 2,250-2,270, reserve space for adding positions at 2,200, with a 30-point stop loss, target 2,330-2,360