It takes a price to become an international currency.
First of all, you must have a large trade deficit. Only the deficit can let other countries own and use your currency.
Secondly, in order to create a trade deficit, you need to transfer a large part of the manufacturing industry and invest abroad. That was one of the purposes of the Marshall Plan.
You will need to build a huge invincible fleet and invest heavily in military affairs to ensure global trade security and currency credit.
Because of the huge deficit, you will become a country relying on domestic demand to drive economic growth. Because war is the biggest domestic demand, you will gradually become infatuated with the smell of war. Your people will die in a war that will never stop.
Because of the transfer of manufacturing industry, your people will inevitably be troubled by the growing gap between rich and poor. Because of the high costs of war and armaments, your citizens will enjoy worse and worse welfare and public facilities.
If you want to maintain your position, you must attract talents from all over the world. This will inevitably lead to the diversification of your country. Diversified countries will inevitably be accompanied by ethnic conflicts, LGBT and other issues.
If you choose this path, you must always be alert to any risk of failure. Because once the monetary system collapses, countless currencies will return to your country, which will bring an unprecedented economic disaster.
Heavy is the head who wears the crown.
------Shakespeare
In fact, it is good for most Americans to make the world multipolar. The crown is both a blessing and a curse. After the curse is removed, the United States will become more and more like Europe, not more like hell.