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
You can easily call it buy low and sell high rule. The basic rule that have enough importance from a trader or investor. Whenever some bad news come or usually too, you see the market just going down, so you can better wait for the least possible value. Then you can go for best buying and buy as much as you can. That would be increasing profit for you and you could have a better results.