No. Do not efile or mail it again.
They just started opening the mail in June that's been stacking up. So you have to keep waiting.
See this IRS page for the latest information
You should be patient and wait as during the lock-down the IRS did not process mailed in returns. You must not filed again, not by mail, not electronically.
This IRS document outlines IRS operations during Covid-19 times.
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