I think so too, you need to invest in young and cheap coins.
You need to invest in promising coins, not cheap. If you have a million unpromising tokens in your portfolio, you will not make money on it.
And how to understand, perspective this or that coin, or not? Share experiences.
That just is not define. There are many factors in analyzing projects, ranging from the product itself, whether it is already working or not. Ending with a team, whether seen in fraud anywhere or not.