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Only don't sell everything when the price is at ATH. Remember, in December 2020 the price of Bitcoin went to $22k and it was a new ATH, but it was $40k 3 weeks later, and it was $63k 4 months later. I think those who sold everything once BTC price reached $22k were not very happy about their decision in later months.
What you say is right, and
price higher than the previous ATH is a good selling point for users who have invested at the bottom. ~
Yeah, but I was showing in my post above that this attitude is not always a right one. $22k was a new ATH, and yet selling everything right away was definitely a wrong move.
There's a thing about Bitcoin: After some time it's obvious that buying in the past was the right thing to do, even the price was going south for months after your buying. And selling, selling is almost always wrong, even at the time of a new ATH.