Is there a problem with Google's index recently

One of my websites has seen a significant drop in clicks since September. I found that the page index volume has been declining since the beginning of September through GSC inspection. Is it because of Google’s indexing issues that caused a serious decline in website traffic?

I have not seen any issues. I have a new site that I am working on and everything is being indexed just fine without issues.

Monkey Duds said:

I have not seen any issues. I have a new site that I am working on and everything is being indexed just fine without issues.

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At present, the keyword ranking of my website has been declining, the traffic has greatly reduced, and the index is also decreasing.
I have done a 301 redirect, set up some external links, and dealt with some website audit issues and loading speed, but the ranking and traffic are still not good, what should I do?