Recently Gary Illyes has made a statement that Dwell time, CTR and other human interactions are not ranking signals.
So since we can assume those human interactions are not ranking factors, my question is, why so many pages will increase their ranking overtime gradually while their backlinks and content remain the same?
I mean, I know that Google needs time to "pick up" what content and backlinks a given page have, but then it should stay the similar ranking situation without ranked for significantly more words or position change if there is no major algorithm update related to that page.( I supposed)
For example, I had a blog post ranked for about thousands of keyword, those keywords are ranked overtime( generally increase within last three month) and some of those keywords keep increased their position, and extra keywords are ranked 6 months after published while backlinks and content remain unchanged.
Since contents and backlink remain the same. My original hypothesis was because google takes CTR, Dwell time into consideration, those factors could be accumulated over time while backlinks and content remain the same. Now I know this hypothesis is likely wrong.
So my question is, for a given page, what ranking factors of the page will change over time to make the page rank better "over time" while content and backlinks remain the same? (Just name a few will be helpful)
Let me know your thought.
Thank you so much!