Google’s John Mueller reverted a website owner over twitter that “I would not assume traffic changes are indicative of technical issues – it’s easy to spend a lot of time “fixing” technical things when the problem is elsewhere.”

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This implies that John would have a look at your site and the technical issues are not the reason which impacts the site ranking  you might think. Instead of it might be the content quality & over all site issues. And site quality issues are much different & harder to solve rather than solving a simple technical issue.

Here is the Tweet mentioned:

I would not assume traffic changes are indicative of technical issues – it's easy to spend a lot of time "fixing" technical things when the problem is elsewhere.

— ? John ? (@JohnMu) May 28, 2021

He also elaborate this in the past Video of SEO hangout mentioned below:

If you see a sudden decline in traffic, in most cases this is not likely to be due to a technical issue. https://t.co/HgqKtK2Nqy #GoogleHelpHangout pic.twitter.com/wTkKbdCGej

— Marie Haynes (@Marie_Haynes) May 31, 2021