In my opinion much of the decline can be attributed to using the same keyword content formulae too many times. Word press still works great but you need to makes sure that google chooses ur page out of the 10 similar ones.Not gonna lie...i have seen weird results on wordpress.
Same keyword research, same posting routine but traffic feels way slower than before.
Some posts randomly pick up while others just sit there doing nothing.
Feels like old seo trick do not hit the same anymore.
Is wordpress still worth building on in 2026 or are we missing something big here?