Where will my stimulus be going since the account that you have on file is closed

Because of the speed at which the law required the IRS to issue the second round of Economic Impact Payments, some payments may have been sent to an account that may be closed or, is or no longer active, or unfamiliar. By law, the financial institution must return the payment to the IRS; they cannot hold and issue the payment to an individual when the account is no longer active. If Get My Payment shows "Payment Status #2 – Not Available" you will not receive a second EIP.

The IRS advises people that if they don't receive their Economic Impact Payment, they should file their 2020 tax return electronically and claim the Recovery Rebate Credit on their tax return to get their payment and any refund as quickly as possible.

The above is an extract of the IRS Statement on the second stimulus check.