Your site is missing out on the benefits of being Mobile Friendly because I believe Google gives SEO preferences to validated web pages. As you may well know about 60% of traffic comes from Mobiles and Tablets!
Why restrict your exposure?
Did you take the time to read why the web-page was not Mobile Friendly? I did and noticed there was a good chance of a simple fix which would achieve the desired result.
The source script and related files were:
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downloaded to my Localhost then uploaded to my server
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a single meta head tag line was added to the web-page
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uploaded the modified file
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validation results of Google Mobile Friendly Test
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Results: