I too am experiencing the same problem.
I don’t know if it will help, but the first is a change in Google’s algorithm.
The same problem occurs all over the world.
The second is in ‘Index’ > ‘Page’ in Google Search Console.
Are there any ‘404 pages’ and is the properly registered content indexed? This is to check whether or not.
I can’t be 100% correct, so please use this as a reference.
