Chapters after the novels feel like they are missing something…

Wait so these chapters are no longer following the novels? Where did the novels end? Because yea I was about to comment that the story feels like it changed. It slowed down I think? And feels less interesting now.

It ended around when he took over the new body. To infiltrate the demon sect

Yup, that tracks. Before whenever he went "on an adventure" before the story stayed fairly concise and focused. Now in the demon sect things seem to be dragging on quite a bit...