I did once, but that was the time i really need money to spent. But not my true nature though in fact i am a true holder if i know the token i been holding is too much potential then i am willing to hold it even if its months or years.
for potential assets in the future, I don't think it would be wrong if you want to hold back to the long term. but for assets that are just on the market, I think short trading is the best choice. it maintains and reduces the risk of high losses.