Never stopping to buy bitcoin should even be every investors watchword or motto.
Every time is good to buy. Peaks, dips, corrections etc as long as there is available funds to buy at that time.

It may look pretty expensive at that moment, but only time will tell if it was worth it or not. Like you said, it is either one buys now or regret when the value is much higher later on. Just in this past few weeks, so many people have regretted.