I've fallen deep into the Zizek hole this year, a good follow up book to Sublime Object is the Parallax View. He tries to lay out his basic philosophy and apply it to different subjects in it. After that idk, Zizek is kinda repetitive, I have to imagine you get diminishing returns in terms of new ideas after more than one or two of his books. Probably just reread those until you fully understand his worldview. Maybe after that you work backwards and start reading Lacan and Hegel to get a sense of where he's coming from.

I know Zizek is kinda a meme but he has a genuinely interesting philosophy. He talks a lot about the nature of consciousness, neuroscience and its relation to psychology and philosophy, theology, and a bunch of other topics that aren't as prominent in the internet conception of him but are very relevant to today. Plus once every hundred pages or so he'll give a review of the Star Wars prequels or something as a treat.