I would replace The Republic with a good Micro textbook for anyone who hasn’t read one. A solid grasp of the mental framework that underlies Intro Micro is useful for anyone trying to parse society: not as the only framework, but an introduction to the fact that there are competing and incompatible mental frameworks. Following that, I would replacing your book with an IR textbook, which must cover different and competing theories. They will be shallow introductions to complex thoughts, but they will give the reader the critical chance to test and compare the competing and incompatible theories against each other, and realize that no one theory has a convenient answer for all problems. The discussions of constructivism and responses to the neo-neo “debate” will help you recontextualize and better understand the micro textbook. Reading these books (If you have no idea what to go for, I’d recommend Cowen and Tabarrok for Micro and Introduction to International Relations: Theories and Approaches by Jackson and Sorenson for IR) will give you a broad overview of many theories, including modern ones informed by modern data.