Ban cash and implement negative interest rates.
Alternatively, you could pass a law allowing banks to not deposit cash deposits at full value. But that could create a rush to a near all cash society dropping credit cards. The opposite of what they want.
The idea of central banks directly funding budget deficits is being discussed seriously by serious people. When they come up with names for it, and provide limits and a plan on how it all gets managed, it will sound pretty good. Part of the sell will be tax cuts for the people. And people will like the idea of government debt not increasing from this.
Trading this with ETFs will get interesting. I guess where ever the free money goes is what you invest in. Like bridge builder stocks. We will have so many bridges.