I apologize right away, English is not my first language.
I agree with the previous comment, up to 500-600 chapters our main character influenced the plot, it was interesting to see how he made plans, how he realized them, how he gained strength. The world order itself was interesting, the conflicts in it and the situations our protagonist found himself in were well described, so they were often difficult, but gave him the opportunity to somehow get out of them, using the intelligence or strength he had acquired earlier. The dynamic with the female characters was interesting, the way our protagonist used them to overcome his trauma of mistrusting others, etc.
But somewhere after chapter 600, it's like a different work, I don't see our hero as something that has been building for 500 chapters, now he's a dog running from point A to point B and unable to affect anything. Some plans are just discarded, if they exist at all.
It feels like every antagonist got +100 IQ, and our hero got 100.
And even the power that he had, it's like it just disappeared, if before our hero could fight some of the strongest characters alone, now to defeat one, he has to gather a whole group, I realize that because of some nuances he is limited in using all his power, but it doesn't suck that much. And starting at chapter 720, the river of shit started. With incomprehensible and unnecessary drama that makes you want to quit reading.
To summarize, perhaps the author needed to take a break and think things through better, because everything that is being written now is too confusing. I'm going to put this work aside for now, maybe I'll finish it someday, because right now I have no desire to continue