One thing that you have to in your life is to choose your risk exposure to typical assets: cash, bonds (in particular long term bonds), stocks, real estate, and maybe commodities (like gold, or maybe Bitcoin for the courageous). Sharpe ratio is a good way to measure risk/return.

You have 100% at any given point, where does it go? Not buying anything is going 100% cash. That's why you have to do it - you're always in some exposure.

Then you can always lever up securities, effectively going negative on cash. Example: 105% stocks, 195% long term bonds, -200% cash can be achieved by going 35% UPRO, 65% TLT; only for the brave souls among us that do not fear a 300% leverage. This is roughly how the Bridgewater All-Weather Fund operates (AFAIK you can choose your leverage level there).

Many households are quite levered up by getting a mortgage. A mortgage with downpayment of 20% results in 1/0.2 = 500% leveraged exposure to the real estate market (slowly declining over time as the principal is paid, or if the house appreciates in value).