Yes... selling depends on your personal goals, and really if people invest into bitcoin for the long term, such as 4-10 years or even longer, then they can still be advantaged by having value in bitcoin, even if they are not selling it and even if they are going through various drastic ups and downs along the way... So a fairly BIG question might be how much BTC are you trying to accumulate, and if you reach your target and you sell it all, then you weren't really wanting to accumulate bitcoin, but instead you were wanting to accumulate dollars.. so are you in a better place if you sell out of bitcoin and get into dollars, or would you be more likely to be better off if you either completely stay in bitcoin and maybe just sell small amounts from time to time to the extent that you might no longer be in an accumulation mode.
Some of those selling strategies are going to become more clear as you accumulate BTC, but people do frequently get distracted and they sell too much BTC too soon, and then they have to rethink their whole perspective including that they might have ended up psyching themselves out of having a BTC buying and/or HODLing strategy rather than devolving into trading and gambling kinds of thinking about their stash.
Basically Bitcoin needs plan. And in my point of view anyone has Bitcoin or he is buying with DCA method so I think he should never sell all the Bitcoins at once. He always hold some amount of Bitcoins. And if anyone will believe on Bitcoin and will Hold for 4-10 years or even more so definitely Bitcoin will give benifits of his/her believing.
And selling too much earlier is also the personal decision of anyone. But in my point of view if anyone will sell all Bitcoins to soon so he has less knowledge and he needs to learn more about Bitcoin. And definitely he will regret on his decision if he will sell Bitcoin to soon.
And Accumulation and selling are two opposite words. If anyone thought that he will accumulate Bitcoin and he selling so definitely he is not accumulating.