$BTC's market in the past few days has been quite volatile, and the current price has returned to the position before the rise on the 13th. There is some support at 103500, but the most critical support level remains at 100800. As long as it does not fall below 100800 in the next 4 hours, the market will continue to fluctuate within the wide range of 10,000 dollars.

The current trading strategy is simple: short at high points and long at low points. However, my recent profits have mainly come from shorting. After all, once selling pressure triggers panic or negative news, it can drop quickly. Conversely, a strong upward movement requires significant positive news and sufficient capital to absorb the selling pressure in the market. Currently, there are signs of a rebound in the 4-hour chart, but given the current market, the rebound strength is not expected to be very high. The upper pressure at 106100 can be a point to try shorting, and there are also Federal Reserve news coming in the early morning.