Who's it that says bitcoin has a specific period of purchasing it bitcoin? You should change that awkward thought and get your coins at when you can for bitcoin would always hold the best for you in the nearest future.
Is there someone that says such? because what i see in this market over the years is that we can purchase anytime we wanted and any price we believe it is worth buying .
maybe there are some stupid people that has this attitude in trying to fool someone to believe in their belief but they are very few from us who wanted that all needs to either use crypto or Hold completely.
Those who consider only the DIP as when to begin purchasing Bitcoin are those who are in for a quick profit withing a shorter time frame. Basically, Bitcoin investment requires a policy of long term holding than just quickly and often taking out profits at every price increase. I have seen a few people who only invest when the price begins to increase actually likely from a DIP, it is not a better approach but clearly shows no doubt that even if the price adds in value would not stop them from investing.