Is there a problem with Google's index recently

[robin222]

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?

 

[Couch Monkey Media]

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.

 

[robin222]

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.

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?