There are a lot of mixed feeling about The Devil is a Part-Timer!! out there, with a lot of them being somewhat justified with how long it took to get a second season and it feeling rather disappointing. The story in season 2 part 2 (really hate the part system) has picked up in pace from part 1, and even though it hasn't regained it's full grasp it had in season 1, I had found it to be enjoyable. Whether you continue to watch after this point is hinged entirely on if you're hooked into the story or not, since this seems to be one ofthose stories that seems to do better when its more episodic and humorous as opposed to the over arcing storyline with a grand epic to tell. If these newer seasons don't spark joy, just feel free to watch season 1 again and forget the rest existed.
At this point, I'm mostly just watching to find out more about the sephirot that they're drip feeding us and whether it will actually have a meaningful payoff after all this buildup.