Personally I went into Gold for long term ROI (though that's pretty much a bet on in the long term there being crisis with the currencies themselves) since even ETFs and other spread investment stock strategies are still affected by Market manias and their aftermaths which can be triggered by HFTs (which at times create positive-feedback loops that turn into market runs).
That said, I was in the Industries that got hit hardest in the latest 2 major crashes (Tech in 2000, Finance in 2008) - to the point of being with Lehman Brothers in 2008 when they went bankrupt - as well as in Britain when they voted to Brexit (which tanked the pound, something which, by the way, this strategy protected me against), plus being in the Finance Industry is a bit like working in a sausage-making factory (once you see how sausages are made, you never want to eat one again) so I have a good excuse for having a "trust nothing" ultra-conservative savings protection strategy 🤪