I teached somebody 2009, how to make with my CMS a good site for Google AdSense.
The site had record revenues in the old time from nearly US$ 1000 a month and is now down in the US$ 30 ... 40 range.
I changed my own sites already years ago to mobile friendly and https.
Now I changed also his site on January 22nd to https, mobille friendly, UTF-8
Google Analytics show a constant decline in visitors since January 25th.
Now at 50% less than usual.
Google Analytics shows also the expected change in visitor behavior,
special at mobile and tablet.
The site has 3904 pages defined, so I wonder why site:his_domain.com shows 4270 pages.
It is all with <link rel=canonical HREF= since 2009.
Search console user friendlyness for mobile shows:
2019-11-02 1798 pages red - several problems for mobile
2020-01-18 1463
2020-01-19 1262 after a long steady decline, a jump downwards, 3 days before the big change.
2020-01-25 1142 red 48 green, first time that the change shows up
2020-01-30 87 red 228 green
Any interpretation what is happening?