Sometimes we have to make hard decisions if we do not want to allow that a coin takes us down. We have to take the loss and get out of the investment , but if we are extra confident with the project then we can choose the long HODL option.
you are right, we must make the right decision so we don't get a big loss or miss a golden opportunity to get a big profit.
i had missed a great opportunity several times and it made me a little frustrated, but in the future i tried hard not to repeat it. so, we have to do some research before deciding to keep holding for a long time or sell it now.