There was a notable drop off on Infamy, when he was really sick with sickle cell. And then after that he just made a decision to change his rhyme style to more of a spoken word type flow. Way slower, and way more conversational, and less strict rhyming conventions. Expanded subject matter as well, diving deeper into conspiracy theory stuff and spirituality.
If you don't like it as much, that's fine. But a lot of people frame it to this day that P was trying to rhyme like he used to, but just couldn't do it. When the reality is he deliberately made a change to his rhyme style. He spoke on this several times during the 2010's.
One of the few artists to make a change fairly deep into their career, and it always bugged me that a lot of folks didn't understand that (love it or hate it) it was on purpose.