So as long as retail and institutions are willing to put their money on those two then it is hard to say when this bull run will last. As per historical logs, there's supposedly a 4 year cycle in specially in bitcoin, but I'm not sure if that trend will continue as the narratives has made a U-turn this 2020-2021.
I wouldn't trust the historical logs, 2020 and this year has been a wild thing for financial world, the Gamestop sudden pump, the ATH of bitcoin and ethereum, I think that this year will not be the same as the predicted 4 year cycle. The run is not yet over, no article or topics have discussed that the market has left the bull market. We have to positive that this year will be a little different than what we have experience from the last runs of bitcoin that was filled with regret and disappointment. There is a talk that 100k is a possibility for bitcoin this year and the other years to come so what we can do is hope that this hype will translate into something.