Starting somewhere this year, all of my new content is not beeing indexed.
I wrote 4 articles : 2 in january, and 2 in february.
All contents are written with my two hands, long and extensive articles about one topic.
No technical issue, good performances with pagespeed.
Internally linked, one from the homepage.
If I update an old article, no problem, it will be reindexed.
It's just my new articles.
In other websites I have, my new articles are indexed in hours.
We are numerous reporting this (specially in my home country, France).