What are you gonna do if a black swan event happens?

You wake up and check the charts: BTC is down 30% and Alts are crumbling.

You hurry to see what is happening and it's all over the news: [insert black swan event here]

The market is on a downtrend and your portfolio is going down at each minute.

Do you pull everything out or just HODL?

I've always wondered what would be the best thing to do and if I should just pull it out on a downtrend and just comeback in later or just let my portfolio soak it all in

One way to be prepared is taking profits, which I'm already am, but I feel I should be ready to take advantage of this situation too