For me, as for the holder, the biggest fear is to make a mistake and sell a promising coin at the beginning of its growth, unfortunately the cryptocurrency market pushes us to the like.
There is no external force which may compel us to sell or make any decision in hurry. You are free to decide and act anyway you want that is great in the crypto trading. HODL is most likely loved by the professionals who want to stick and stay with the crypto industry long life and that is the reason they get massive profit of their investments. But those who sell in hurry for little profit just waste their time.
I can't call myself as a professional but I am comfortable of holding.
In fact, because I HODL, I miss the train last bull run, so I want to ask do we have the train coming this year?
If not, then I must still hold, but in case that train comes again, I know I am ready to ride with it.
There is a danger, but I love that danger as riding is like a roller coaster ride, not advisable for the weak hands.