The main method is the one you already identified:
Economic Impact Payment Information Center — Topic I: Returning the Economic Impact Payment | Intern...
Otherwise, see the link below for approved payment methods for the IRS: Paying Your Taxes.
It is smart to set the excess payment aside for now, if possible. Then, it will be available for return if you receive further instructions from the IRS. There will be an opportunity later to correct any issues.
@JoandJerry
