every moment is a very valuable time, so with sufficient analysis and with confidence that what will be done can be profitable, is the right time for you to buy and hold it and sell when it is already profitable. buy when prices go down and sell it when prices go up, this principle must continue to believe that it is the right time for you to buy or sell it.
that's the right thing. however every moment is the right time, it's just that it all depends on your strategy. to be honest, if I had more assets, I might buy some altcoin to hold. however, if we choose the right coin then it will be the right time.