I think you forgot the payment deadlines here, as the United States currently has a debt that is overdue, while many countries that borrow from the United States may not want to pay their debt now.
China, for example, all of its trade surplus is used in the form of dollars for nothing but manipulation of the value of yuan in order to promote exports.

I agree with you that the United States has several ways of repayment, so it can, for example, devalue its currency and thus reduce the value of its debts, but there are many catastrophic effects of this decision.
The easiest solution is more debt.