> They tried and failed in 2019.
That's because COVID-19 happened. :)
The Fed is buying up bonds: at some point they will mature and the US government will have to either (a) increases taxes to come up with the money to repay them (thus taking money out of circulation via the IRS), or (b) roll the debt forward by issuing new debt to pay the old debt.
Given that a few years ago the UK rolled forward some debt from the South Sea Bubble, Napoleonic Wars, WW1, etc, rolling forward debt is not as big a deal as most people think:
* https://www.theguardian.com/business/blog/2014/oct/31/paying...
* https://www.nytimes.com/2014/12/28/world/that-debt-from-1720...