Recently start to analyze data for trading decision, here's the first point of view:

Bull and bear markets follow patterns. At the end of a bull market, BTC rises about 20% in a day, while altcoins rise 30%-50%, attracting the last wave of buyers and exhausting demand. When BTC stops rising and consolidates while altcoins hit new highs, it's a signal the bull market is ending. For example, in February 2021, BTC reached $59,000 and then consolidated for 3 months while MKR continued to rise. Bull market peaks usually last 2-3 months, with funds exhausted and many inexperienced investors entering. Investors should monitor BTC and altcoin performance; if BTC consolidates after a bull surge and altcoins hit new highs, it's likely the bull market is ending, suggesting it's time to reduce positions.