1. This is a fallacy of the infinite ATHs. You are assuming the 20K wasn't the last one, and there will always be an even higher high. History tends to disagree. Inventions that can be reproduced and copied freely tend to lose value over time.
2. Let's say you are right and there is a new ATH of 25K that happens to be the last one. Using your same logic you will hold through it and let it fall back to 6K, 3K whatever...
You can have all the Dogecoins you want but there is only one Bitcoin and it is accepted as the Gold of the Cryptos
My logic of holding on now is that the price has already dropped too much to consider selling. When it enters the euphoric phase the next time I will take about 40% off the table and hold the rest. At what price level that will be I am not sure but probably at or above the 25K that you speak of.
Looking back now when it when up 4x in a month -- of course it would have been a great time to sell some but I was giddy with success and played it dumb.
