Someone smart once laid it out pretty simply, and honestly it hits different when things get choppy:

Buy the dip. Stack what you can — we're living through a once-in-a-lifetime shift. Skip the leverage. Don't chase every shiny altcoin. Be patient. Go outside. Pour some wine. Do literally anything else if you're feeling antsy.

Sounds basic, but on days like this? It's the stuff that actually keeps you sane. Most people forget the fundamentals when the charts go red. The ones who remember tend to be the ones still around a few cycles later.