The altcoin market is undergoing significant changes as the Altcoin Season Index from CoinMarketCap has dropped to 30, highlighting Bitcoin's dominance. This index measures the performance of the top 100 cryptocurrencies over the past 90 days, excluding stablecoins. A score below 75 indicates Bitcoin's outperformance in the market. Currently, Bitcoin holds a 55.78% market share, signaling a shift to a Bitcoin-centric market, requiring cautious investment decisions in altcoins.