Just notice how when BTC gained dominance during it´s last leg up to 20k in 2017. After that Alts reached ATH`s 3 weeks later.
But always, in the other cycles too, BTC gains a huge peace of Dominance to reach the final ATH, so, if Alts keep gaining Dominance in the next weeks months,
BTC is most likely going to top in 2022. Otherwise we could top in December.
The signals that I am always looking for to predict the eventual ATH of BTC and Alts are the: - Dominance moving first to BTC until top and huge jump for Alts right afterwards. - Quantity of BTC`s in Exchanges - BTC getting closer to the top of the Log chart.