The impulse wave of 2015 - 2017 could repeat in a similar manner. The chart of 2020 - 2021 looks relatively alike so far. I projected the potential waves with the trend based tools. You get a slightly different result with close prices.
Also, back then we had the volume peaking with a huge amount at the end of wave one, tricking people to believe it's over just like this time. But the price came back in an impressive way.