I think it's wrong to compare the old bear market history with the future bear market, things could play out differently, I was into crypto in 2019 and I am very sure that there was a bear market years back before 2017, in 2020 there was pandemic, no one saw that coming.
A brief history of bitcoin in the past will always be a reference for the future. The movement of Bitcoin cannot be separated from past history, although the movements are not the same, the four year cycle cannot be separated from Bitcoin. There is always Bull after the Bears leave. The bearish market may be scary for many investors especially for Newbies who are just starting to invest in crypto assets. There is no need to panic in the face of a Bear Market, because there are many strategies that traders and investors can learn and use to get profits.