~
It's not that easy of a mindset, OP if you even care. For newbies, the usual term "FOMO" becomes common to them when it comes to those situation. Whatever ROI that they had missed due to another ATH caused them to panic to immediately buy because why not right? It keeps them thinking that there will be another ATH. Don't believe me? It came from my experience when I was still starting in crypto and it was a truly horrendous experience.
Good thing I wasn't fully committed yet to crypto that time.
For newbies the situation really becomes very worst some time because they often invest in scam coins with in the rush to get the profit. They often do these regrets and they often miss. But with time they learn to remain calm and do not rush and they then watch everything first then learn and after that take decision.