Start by listing the desired characteristics of a global trading currency, then identify what alternatives exist.
———
You said it with your words- a currency backed by commodities and goods. Oil, energy, metals, food, Gold, etc…the US and Russia has the resources, however Russia beats the US in every sector. Brics has discussed ( and others) commodities based currency, not like the US which is currently based on debt.
The US could be the largest exporter, but Senike Joe and the Greens have shut it all down.
Commodity_backed currencies are unstable.
Particularly the consumables.
Gold’s primary advantage was that it was inert, it didn’t spoil and it wasn’t used up.
But there’s nothing like enough of it.
So perhaps we should ask why do people use the dollar, rather than the Euro. What did the Euro do wrong?