Rotate from Bitcoin into large-cap altcoins (ETH, SOL, high-quality L1/L2 tokens) when BTC dominance (BTC market cap as % of total crypto market cap) breaks below a key support level on the weekly chart. Historically, BTC dominance declining from 60%+ toward 40% signals capital rotating into alts, with altcoins typically outperforming BTC by 2–5× during this phase.