Thank you for pointing that out. While this is a fact, many people still failed to do so and incurred losses and had fainted hearts. And perhaps they are failing to do it around this time as well, which can be due of too much eagerness and forgetting some important matters to consider in doing HODL.
They're forgetting it because they're pushing their emotions rather than the important strategy that they have to use. And as they saw the bull market, they're forgetting to take some gains for their own share. While they're thinking that the market will go as high as it can, they don't know when to take profit and instead, they've taken losses so they have to cut loss again if they ever bought at the top without creating a strategy of when to profit.