The topic has become a debate of buy the DIP vs. DCA, but it won't truly matter what you "must do". You just do what you want to do or what you're comfortable doing. Plus how you buy will never be as important as what you do after it, which is HODL. If you can't HODL and have a low time preference for Bitcoin, then you have already failed.

Ask yourself, why are central bankers offended by the existence of Bitcoin like it's a declaration of war against them? I honestly don't know why, but if they really hate it and discourage people from owning it, then it's probably doing something right.