According to what has been observed over the last few months, the usual tendency of all tokens given by the ICOs is to suffer an abrupt fall, and that is why many tokens are currently valued below 10% of what they were valued during the ICO. Therefore, time seems to have proved right to all those who decided to sell as soon as possible.
I, for my part, thought that it was best to hold my coins for a long time, hoping that gradually their price would increase in a considerable way, but the only thing that has happened is that the vast majority of the tokens I have have become worth practically zero, when if I had sold them from the beginning today I would have thousands of dollars in my pockets.