It looks quite difficult to get into that phase again, now we can see where BTC dominance is already very large in the market, I think ALT season will come when BTC dominance decreases maybe in the range of 50%, so you can estimate if BTC dominance decreases meaning ALT season will appear soon.
50%? By that time, you have already seen several 10x altcoin mewns by then. The key here is determining when the journey from 67% to 50% Bitcoin dominance starts. That is always the goal of trading - predicting/anticipating when a trend reversal happens.