Gold, inflation-linked things like beaten down oil/commodity stocks, apartments in fundamentally different locations (preferably cheap), but also cash for deflation (or bonds, but bonds are really no longer a thing since covid put a final nail into the yields, imho). And it's all about % allocation. S&P500 is great if you use it right, besides most of us already have a large exposure to the "US stock the world beater superman" via engineer salaries.

Farmland would be perfect, but unless you're actually a farmer and know how to survive on your own this is simply not in your reach. I'm just a software guy, really like this profession, but doing software mostly precludes having the knowledge of a farmer.