What makes the USD have to be the world reserve?
Historically it was the Greek Drachma then the Roman Denari, the Byzantine Solidius then the Arab Dinar.
The first truly World Reserve was the Dutch Guilder, helped by the Dutch East Indies Company. It was the 1860’s where most Industrialized Countries fooled the UK and put there currency on the Gold Standard and the Pound Sterling became the International World Reserve.
The US Dollar took over post WWII, mainly by default since most of Europe and Japan had no Money left / were in debt, only the US had any money left.