$BTC It reached $100,000 again and I'm ALV 😱

So I checked the charts and found this.

$BTC

BTC

106,108.32

+0.56%

I mean, it went down, but then it went up really well. I guess I should have taken advantage and bought it, to which he asked me, "Should I wait for it to go down and buy it right away?"

Buy at the moment when the price is down?