People who bought at $40k and $50k are not wrong mate. You shouldn't blame them for any reason, when it was $40k, down from $69k, since it came down from ATH, it seemed that the $40k was the low. But since it turned out that it wasn't the low, there is nothing to trouble yourself about. Even El Salvador bought at the range of 50k.
You do not have to regret for buying $40 to $50k if only you bought bitcoin. But if you bought other coins, I don't know your fate but for bitcoin, we are so so sure that it will touch ATH and still make a new ATH. It is just a matter of time and delay. You will smile at the end.
In the end, there will still be a profit, but those who bought at a price of 40k and above have regret, because they could buy now at a lower price. On the other hand, it is easy to do in theory, but it is more difficult to implement it in practice. No one could know at that moment how low the price would fall, or if it would fall at all. What if the price continued to rise and up to 100k?
This is always difficult, so now all that remains is to hold and, if possible, buy bitcoin now to average the price.