I’m not sure how relevant it is to you but I really enjoyed Seven Types of Atheism by John Gray. Also enjoyed Animal Liberation by Peter Singer (foundational to modern vegan movement if that’s your thing) and The Age of Surveillance Capitalism by Shoshana Zuboff (which tends to be in philosophy sections at book stores at least.) I will say the latter is a little overdramatic but it is a really interesting and important subject matter. Another one about tech ethics is Stand Out of Our Light by James Williams which is probably a better introduction to the ideas explored in The Age of Surveillance Capitalism.

I definitely need to get into some more hardcore/classic philosophy since I do tend to read newer stuff rather than anything foundational. However, I also think it’s perfectly reasonable to explore more academic explorations of topics you’re already interested in in the self-help that you read. For me, the ethics of modern technology are a big thing so I have a dedicated tech-philosophy TBR going at the moment. If the topic is something people think about at all there will be some philosophy work out there on it.