It is only recently that the IRS even started opening mail that piled up in trailers for months during the pandemic. And you mailed your amended return, of course. So it is possible that your envelope is still in the giant pile of unopened mail. If you used a mailing service that tracked it such as certified mail, you will at least know it was received. It normally takes about 4 month for the IRS to process an amended return, but it is taking a lot longer now. All you can do is check the IRS site for amended returns now and then to see if your return has ever been opened by a human and put into processing. Sorry.
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
**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.**
