Long-term planning makes sense only with cryptocurrencies that have already proven themselves, everything else is actually a pump&dump scheme from which many come out with nothing. Many people have a hard time understanding that if they once made money on a coin, it may never be possible again, because it actually had a one-time purpose.
On the other hand, those who can afford to invest in Bitcoin have always profited so far, especially those who followed the cycles and invested when the price was at the bottom, and sold whenever a new ATH occurred. Of course, it is not easy to precisely detect the absolute bottom or ATH, but smart investors always buy when the price goes down and sell when they are satisfied with the profit when the price goes up.
In any case, any plan is better than none.