you are correct. back in 2017 price went from start of $150 to $20,000 then collapsed to $3200 then back to $20000 again.
in 2021 we will have the same thing too. the price will go from the start of $3200 to $500,000 then collapses to $100,000 then recovers to $500k again.
If the valley pattern will be replicated then that can only mean that everyone can just hold their coin and wait for the next valley replication. I hope that each iteration of the valley, the price of bitcoin will not be the same as the all time high of the latter valley, someday and hopefully we will reach that amount.