First we need to remember that during the last 30 days, the prices have increased by almost 100%. So a correction is due very shortly. I am expecting this and therefore will hold on to my coins if a crash happens.
Why would you be holding now if you expect that? If you're right, you can double down. If you're wrong, do you really think it will keep going up and up like this? Which one hurts you more?
This is why smart people take partially profits and do not all dump what they had invested. This way you will still be in and can enjoy the party while the dumpsters will sit one the sideline and have to watch the train continue riding without them.