An index that can be used when BTC is in a pullback

The BTC Dominance Index refers to BTC's market share among the top 20 altcoins. After observing for a while, I found that when BTC pulls back, going long has a historical win rate of about 80%, which is roughly opposite to BTC's trend. During periods of high volatility, when BTC rises, this index falls, and when BTC falls, it rises. Additionally, it won't drop sharply, which is very friendly for contract trading.

However, there is a problem: BTC's market share is already quite high, leaving little room for further gains. So, one can only wait for BTC to pull back before making a move. Sometimes the trends are not completely opposite; for example, when BTC surged to 107,000 yesterday, the market share also skyrocketed, which is quite strange. However, this also reveals the obvious signs of manipulation from the big players behind the scenes. Other assets did not follow BTC's movement; the big players only pushed up BTC to trigger the short positions above, and then the price fell back, causing BTC's market share to decrease. This indicates that the big players achieved their goal and subsequently started selling off. This was a premeditated action, as previously discussed in an article about how the big players coordinated with news to harvest liquidity.