I think there are no safe harbor investments at this time. Even gold is unpredictable.
Personally I went 80% world excl US and 20% equal weight S&P500 to hedge against what I think is an AI bubble. But if the market decides to adjust Nvidia's valuation 20% downward next week, I expect there to be ripple effects throughout the economy.
(Like the .com bubble, I think the tech is genuinely transformative and here to stay, but the valuations are just ridiculous.)