I think the answer to strategies for black swan events is the same it always has been. Own a piece of land, some portion of your portfolio should probably be in gold/silver. You might toss in some crypto. Get/stay out of debt. Get a passport. Have enough savings so you can GTFO your country if necessary.
Also, here's the math on catastrophic events. It's more likely than you think.
Actually in real hard black swan events debts are easy to escape...
Land is also easy to take or can be worthless. What are you going to do with it, farm it? Live in the middle of nowhere with no amenities and no preparation?
Assets are easy to steal, and are only useful short term, besides something like living space or private transportation to get away.
Most useful are connections, as always. Then means of production, especially of necessities. And finally, just having the right kind of canny thinking.
Something like BTC is even impossible to cash in without an internet, working like a glorified IOU.
Also, here's the math on catastrophic events. It's more likely than you think.
https://medium.com/s/story/the-surprisingly-solid-mathematic...