The old rule of thumb was 5 categories, evenly split: stonks, bonds, cash, gold, real estate

It's a little more complex now with the basis of the dollar itself in question (and bonds and cash both inextricably tied to the dollar).

If the dollar goes to shit, existing bonds and cash are worthless, but stonks and real estate can go up in nominal terms if not real terms. (And then be taxed on nominal gains, yay!) Debts go away in a dollar collapse. Gold retains value in principle (worked for 5000 years, at least if nobody knows you have it), crypto - maybe but it has its own problems. And of course lead is also important.

The number one thing to remember is don't think that any rules of the game won't change overnight if it suits the PTB.

IMO therefore it all comes back to diversification and rolling the dice, and that includes having traditional investments.

It also might include for example buying a rental property with an 80% LTV interest only loan, if you can break even on it and can afford to lose the 20%. In some scenarios the loan vanishes in real terms and the property value goes up in nominal terms. In others you refinance at lower rates. In others you sell it for a (perhaps real) profit, or make a profit on the ongoing rental. But this is also subject to RE taxes, gains taxes, and the threat of force majeure of various sorts (being forced to rent to migrants for peanuts, for example, or squatters' rights, or confiscation). So, it's still a crapshoot. Be prepared to default and walk away from the 20%.

The other key fact to remember is markets can remain irrational longer than you can remain solvent.. so contrarian bets often fail due to timing. This is another argument for diversification into traditional investments.

The only thing you know you can keep is what is inside of you - your skills, your mind, your love, your cunning, and hope that you have enough skills, and diversify your wealth so that you have some chance of surviving in not too bad conditions and even keeping some of the wealth through what is coming.