In May 2020 I mailed to the IRS an amended 2018 return to take an energy credit. I have had no response. Should I have received a response by now? Follow up ideas?

[Cass0317]

Three weeks after you mailed your amendment, you can start tracking its progress at the IRS Where's My Amended Return? site. 

Please also see Form 1040X, Amended U.S. Individual Income Tax Return, Frequently Asked Questions