I find it hard to justify any conclusion other than we're about to repeat the crash of 1929 in terms of stock prices. Back then, stocks dropped 90% over 3 years. We'll be lucky if 10% actual value remains after the bonfire that's about to happen.
Long term, you're getting eaten by inflation, but when the power grid, and most cell sites are down, cash is still king.
The real lesson I've learned is that a small generator consumes about 10 gallons of gasoline per day. There's no way to store enough of it to last through a total collapse, even if you could keep it from being stolen.
I'm not a financial planner, and my gut instincts have been wrong far too many times for me to give advice. I'm just noting the odd thing going on right now.
This is a sarcastic answer, but I’m only half joking.
The only winning move is not to play. Go to your local instrument library and grab your self a guitar. If your 401k vanishes, at least you know how to play the guitar and can entertain your self through the collapse of the system.