the right time for invesatsi is when the price of a coin has bad news so making a coin makes its price down or collapse is a good time to buy. That's if you ask when is the right time to invest
I think every person who is holding some bitcoins with him is aware of the fact that when he has to invest them and when he has to buy them. We can also become aware of this fact by ourselves because its a thing of common sense because no one wants himself to be put in loss. Everyone buys bitcoins when their price is down and sells them when its gone much high.