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.”
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:
— Marie Haynes (@Marie_Haynes) May 31, 2021