Hi,
I'm Alex, a skilled Front-end Developer and with very good experience creating responsive website, both from 0 or from already build pages. It should be a straight forward job to re-write the html/css markup on your page in order to make it modern, responsive and pass the Google Mobile Friendly test.
I estimate max 5 days to finish the work, but it will be very helpful if you'll send me the url to your page first, so I can estimate better.
Best regards,
Alex