We could always just end the practice of paying interest on excess reserves which the Fed started when they thought banks were collapsing but there wasn't any economic downturn back in 2008, so they needed to get the banks not to lend out the money they were pumping into them somehow. The Fed's inflation models have been predicting higher inflation than we've seen ever since. Currently the interest on required reserves (IORR) and interested on excess reserves (IOER) are both 1.6%, well above the Fed lending rate of 1.25%.