The fact that altcoins have not moved despite Bitcoin reaching $73,000 can be interpreted as a sign of intense interest in Bitcoin in the market. Usually, during such periods of rise, investors focus on Bitcoin as the largest and most reliable cryptocurrency in the market. This can lead to a large portion of liquidity flowing into Bitcoin and altcoins remaining relatively inactive. However, historically, altcoins have also seen movement after major increases in Bitcoin; in other words, this could be a temporary lull before an "altcoin season".