When the Fed does quantitative easing, they swap bank reserves for bonds held by banks. These bonds are economically equivalent to money which cannot be spent until a certain date, so the Fed is effectively just bringing this date forward.
You see, you can't pay rent or buy groceries with bank reserves but they sure do make it easier for banks to lend money. Someone has to borrow money before it can be spent.
I would also like to mention that the fiscal stimulus by the Biden administration had the intended/usual effect. You know, the thing that QE couldn't create: inflation. If there is an effective tool then the defective tool that distorts the economy can be thrown away.