That is the result from the rate of inflation changes being so steep. As it is, the interest rate is being adjusted at the fastest reasonable (and predictable) rate. There were more than a few people shocked with the first 0.75% increase... not so many this past time.

For addressing inflation, the fed's tools are rather blunt (adjusting interest rate). The issues of disrupted logistics and energy cost increases are ones that the fed has little direct control over. The monetary policy tools are being used to the greatest degree they can. The fiscal policy tools have been left rather idle as those require political will to use.

Returning to the reserve currency question - is there another currency that meets the requirements? Saying "the euro" is ok - and that represents the second largest reserve currency holdings, but, if you are pointing to inflation, it is hitting just as hard in Europe. The yen and the pound sterling have their own issues and China's currency has another set of issues.

The crystal ball gazing of "what about 15% inflation and reserve currency" misses out on what is happening to the rest of the world and what can and is being done to address inflation.