It's hard to say exactly. Sometimes creative differences among the production team or changes in the network's programming strategy can lead to a cancellation. Maybe the storylines weren't evolving in a way that was deemed sustainable or popular enough.
I'm not sure exactly when season 2 of JJK ends in the manga. You might want to check reliable manga forums or official sources for the most accurate information.
Well, JJK Season 2 concluded in the manga at a point where the story took an unexpected twist and left readers eager for more. It's hard to explain without giving away too much, so check it out!