He's predicting the start of an exponential bull run coming soon which makes it different to the other run ups this year as the corrections will be shorter and the price increases longer up to its peak possibly in the end of 2021. I think there will be corrections of about 40% on the way up though. The main thing would be not to sell too soon though as I think it's just getting started.

I personally think the alts will go up a bit as bitcoin goes back to its all time high but it's not until it reaches that all time high that money will heavily flow into the alts.
I have found the bitcoin stock to flow model to be quite useful and accurate over time.
https://digitalik.net/btc/