Holding requires a lot of energy and therefore it is not out of place to say it is for the brave. It is not pleasant to watch ones portfolio keeps dropping in value due to heavy market dumps. Particularly I have seen a lot persons sold their holds when the coins have dropped in value beyond limits which they could hold.
if you missed the opportunity to sell at significant levels for a coin, then keep hold till the end. those people who sold very cheap then when growth begins again they will buy more expensive