That is why there is a crypto-proverb that says, 'Trust no one but yourself'. This is not entirely because others could be wrong but they may not be right as well. My advice is, due to the possibility that the value of a coin could rise with time, you are advice to hold longer as to enjoy more money however, there has also been cases where you hold and in the process,the value drops drastically or in a way you lose, in such a scenario, some people would feel safer selling immediately rather than experience such a condition. Remember in this world of crypto, no certain of what would happen next, all we have are assumptions from deduced facts and ideas. So, it all depends on you and knowledge you have of that crypto you hold