It is too late to e-file. Most rejections are for incorrect AGI. The AGI does not matter now since you only needed it to e-file. E-filing is closed. The only way to file a 2020 or earlier year tax return now is by mail. Print it, sign it in ink and mail it.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**