If for trusted coins like Bitcoin or Ethereum, the right answer is definitely "HODL", but in fact, many of them choose other altcoins to seek profit in the short term. As far as I know, HODL is for the long term and it is appropriate for Bitcoin and Ethereum to be HOLD in the long term.
If for altcoins, especially those altcoins that are below the 100 Coinmarketcap ranking, after being bought and then the price increases and is profitable, they will immediately be sold, maybe they have the same thoughts as me because they are afraid that the altcoins will fall again and even be worthless at some point in the future.