Some day in the future, you will realize that the best time to invest was not today, but some other day in the future, when prices were low. But with the information that you have today, the best time to invest is still today, because you do not know when prices will be low, and you do know that the longer you hold your investment, the more time it has to grow.
Toughts?
Anytime is the best time to invest specially if you are targetting a long term investment. All you need to do is to research on the coins first and analyze if it is worth it to invest on it.