I would watch this weekly BTC Dominance chart carefully

Clear potential breakout above long term resistance trendline for BTC dominance. Now there is always the potential for a fakeout and then break below which could lead to alts increasing, but this is something to watch closely for the time being.

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Now it has broken out and retested trendline as support. Potential coil for next move up, otherwise breakdown of trendline signals a buying opportunity for alts.