Currently, the price of BNB shows a certain rise momentum and has successfully stood above various moving averages. However, from the perspective of technical indicators, the KDJ indicator has exceeded 90, which usually indicates that there may be pullback pressure in the short term.

Investors need to closely monitor the previous high around 657 dollars, as it may form a significant resistance level. If BNB cannot effectively break through this level, and the KDJ indicator shows a death cross signal, then it may be considered to establish a small short position.

From a support level perspective, $650 is a key price point. If the price breaks below this level, it may be worth considering increasing short positions. However, it is recommended to set the stop-loss above $655.5 to manage risk.

It is important to note that the cryptocurrency market is highly volatile, and investors should carefully assess risks when making any trading decisions, and develop appropriate strategies based on their own risk tolerance and investment goals.