According to @cas_abbe, altcoins are holding a key support level while BTC weakens, mirroring an early-2021 rotation where Bitcoin drawdowns coincided with altcoin outperformance, framing a trading focus on relative strength in alt/BTC pairs (source: @cas_abbe on X, Nov 17, 2025). Traders should watch whether this key level continues to hold and whether altcoins outperform during BTC dips to confirm the rotation setup (source: @cas_abbe on X, Nov 17, 2025).