While we are unable to stop a return that has already been filed, you will have options to make changes. These options will depend on the status of your filed return (Pending, Rejected, or Accepted):
https://ttlc.intuit.com/replies/4193396
https://ttlc.intuit.com/replies/3288565
https://ttlc.intuit.com/replies/4804061
If you need to amend your tax return for tax year 2020 or earlier, please see How to amend (change or correct) a return you've already filed for information and instructions.
The option to amend a 2021 tax return will not be available until later in the tax season. You can check the status of Form 1040X's availability here.