Short-term trading strategy (intraday): Due to the clear weakness shown on the 15-minute and 1-hour charts, we recommend avoiding blindly buying the dip. If the price rebounds to the short-term resistance zone around 91200-91500, consider taking a small short position with a stop-loss above 91700. The key support below first focuses on around 90800; if broken, the next target will be the psychological level of 90000 mentioned in the news. If 90000 is effectively broken downward, the short-term may accelerate its decline, and we should follow the trend accordingly.

Medium-term trading strategy (a few days to a week): The MACD death cross on the 4-hour chart signals a strong correction, indicating that the medium-term consolidation may continue. We suggest staying on the sidelines or shorting on rallies. If the price stabilizes around the medium-term support zone of 90000-89500 and shows clear signs of a bottoming out, such as a volume-increasing bullish candle or MACD crossing back to bullish, consider taking a small long position with targets around 92500-93000. However, if the 90000 "lifeline" is effectively broken downward, stop-loss should be implemented promptly, and the medium-term outlook should be adjusted to bearish.

Long-term trading strategy (several weeks to months): The daily chart still indicates an upward trend, with the overall direction unchanged. For long-term investors, this correction presents a good opportunity to accumulate positions. Consider dollar-cost averaging into strong support zones around 89000-87000 or even lower. Key support levels are: short-term 90800, psychological level 90000; medium-term 89500-89000; long-term 87000. Key resistance levels are: short-term 91200-91500; medium-term 92500-93000; long-term 94000.

Possible reversal patterns: In the short term, if 90000 cannot hold, a larger head-and-shoulders pattern may form, leading to a deeper correction. Conversely, if W-bottoms or bullish engulfing candlestick patterns appear near 90000 or 89000, accompanied by MACD bullish cross and RSI rebound, a short-term bottoming out and rebound may occur.