This chart is quite interesting—it tracks the dominance of altcoins, simply put, the total market capitalization of all coins other than Bitcoin and Ethereum as a proportion of the entire crypto market.

Looking at the historical data since 2016, several key moments are marked. The chart highlights three obvious "altcoin seasons" with green ellipses, respectively in 2018, 2022, and the upcoming expected 2026. Behind this actually reflects an interesting pattern—roughly every four years, altcoins experience a significant upward cycle, which aligns closely with the four-year cycle theory of the crypto market.

There is also an orange trend line running throughout the chart, indicating that from a long-term perspective, the dominance of altcoins is generally upward. The MACD indicator below marks several "golden crosses," which often signal the start of an upward trend.

Following this logic, the next "altcoin season" in 2026 is likely to once again boost the relative performance of altcoins. For those involved in this market, understanding the fluctuation pattern of altcoin dominance can help seize market rotation opportunities.