Bitcoin does Bitcoin things
Either you think it will be worth $100-500k+ one day in future, or you don't: I stopped worrying about price movement years ago, and I'm much happier for it.
I think BTC has a reasonable chance of going to $200-300k in the next few years, so I buy when I have spare cash I can afford to lose, and then I wait and see what happens. Either I lose a bunch of money I can afford to lose or I get a lot more money... anything that happens in the meantime is just noise