that is why some should have been sold on the way up, not on the way down....
this is almost meaningless
Yes.... "almost meaningless" because it seems to not be sinking in to your thinking.
Of course, in retrospect, a large number of folks are going to wish that they sold more if the price goes down or to have bought more if the price goes up.
That part seems somewhat natural and reflexive.
What you should be attempting to create is a plan... that causes you to be less reflexive and more prepared for down or up, including extreme down or extreme up, which is in the ballpark of what we experienced in the past seven months.... We had nearly 4 months of extreme up, and then a subsequent three months of what seems (so far) to have been extreme down.
You cannot tell me that it is obvious what was going to happen at various points in the past, because what happened only becomes "obvious" after it already happened.
So, actually, except merely for learning purposes, it should not matter what the price is right now or what the price was through the process of the extremes that already took place, you should be attempting to plan your behavior for right now and into the future for how you are going to set your orders right now and what you are going to do at various points in either direction (UP or DOWN), rather than getting caught up with various preoccupations about what you supposedly "should have done."