Why you want to dump bitcoin. They have advatange and disadvantages of that.
In the context of bitcoin's value, yes, it's really good to hold them. But because its market value reached 20,000$ last December, it is very enticing to sell it because it's really a good sum of money. It can also make you feel any regret when you see that bitcoin has fallen down since then.
We can't turn back time but its really regretful not to take advantage of last years pump anyway, bitcoin is too good to just dump there is more chances soon.