Altcoins are showing one of their most bullish setups in years.

The OTHERS/$BTC monthly chart is flashing major signals:

1. Broke out of a 4-year downtrend
2. Formed a new uptrend after the 2026 breakout
3. Confirmed a bullish momentum cross
4. Closely mirrors the setup seen before the explosive 2021 altcoin season

The next altcoin season could be insane.

This is a textbook example of how multi-year accumulation phases set up for explosive moves. When altcoins break multi-year downtrends against $BTC, it signals a shift in capital rotation—money flowing from $BTC into riskier assets. The 2021 altcoin season saw many tokens do 10x-50x in a matter of months. If this setup plays out similarly, we could see another wave of massive gains across the altcoin market.

Key thing to watch: whether $BTC dominance continues to fall while total crypto market cap rises. That's when altcoins truly shine.