When BTC reaches a new ATH, there's no reason to keep holding, take your profits, and then hold them, you worked hard and your dreams came true, so enjoy them, but keep some money in reserve and wait for another great opportunity to grow your BTC. This is also a great way to increase your BTC.
Obviously, that's what some people have been doing before they were able to accumulate a huge amount of Bitcoin in their portfolio. That's what some people intend to be doing as well, but I will be totally wrong if I say that that's what everyone is doing. Some people have been holding their Bitcoin in their wallet for more than 10 years now, and some Bitcoin addresses are also holding a particular amount of Bitcoin in their custody, which has never changed for quite some time now. I used to wonder how long those people intended to hold them and at what price they intended to sell them. Even in the last ATH of Bitcoin, most of them did not sell. For me, I feel that another approach I can use to increase my Bitcoin holdings is to sell during bull season, reverse the money, and buy back during bear season.