My understanding of Bitcoin is very diverse, those who are involved in it, from investing, trading, mining and so on, the core behind all of that is making a profit and making the best use of Bitcoin to be financially successful.
But if this is what you ask...!
So my question is when is the best time to buy Bitcoin?
Of course, this must be answered depending on their purpose in coming to the Bitcoin market. When investing, of course many people hope for the long term and it is always associated with the ATH phenomenon, if that is what they want, I think at this time it is still worth considering buying and if they trade of course they know the right time to buy and sell, they have knowledge in analyzing things where the best and bad prices are.
Now it depends on you, the purpose of coming to the Bitcoin market, maybe you will find out all that as time goes by.