100% cheapest broad market index fund. Such as VOO or VTI or the mutual fund equivalents.
Way I see it, the leaders of the federal government are all too invested in the public markets to ever let them fall in nominal values. They will do whatever it takes to pump up the numbers, it might just take a few years. So for any money I do not need in next 3 years, it goes into broad market index funds to at least match inflation. (VOO is my personal inflation gauge, or at least it has historically matched the price increases with what I have goals to purchase).
In the event that the feds cannot pump up the nominal values of broad market index funds, then I think I should probably make lots of friends with guns, or maybe get guns myself.