My Client's website has loss it's visibility ranking

Before the Google Core update last September, My client's site has visibility ranking but after it. it didn't recover up till now. My Client's site is an Acupuncture clinic, where should be the problem here? I don't know if it is Content Issue or On Page issue

submitted by /u/manghacker
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from Search Engine Optimization: The Latest SEO News https://www.reddit.com/r/SEO/comments/djjvn5/my_clients_website_has_loss_its_visibility_ranking/>