Apparently this is such a mindboggling issue, let me enlighten you:
It's not an unusual thing for the art quality to drop as the story progresses.
The artist starts drawing a good while before the first chapters are released, so they are semi-chill and put a lot of effort into the panels.
But inevitably the released chapters catch up and at that point they have to sacrifice the sparkly details to keep providing content at a similar rate.
Also, when you keep drawing the same shit over and over you're bound to start cutting corners to focus on the more important things, like actual story telling or drawing a huge pink dick.

Like TF happened to the art style??? I let this series marinate for a while and the art got so much worse, there's barely any consistency in the character design and the anatomy got defenestrated