Debt: The First 5000 Years - David Graeber (RIP) This book neatly picks apart so many things that are wrong with contemporary neoclassical economics, and its a nice 21st century critique as well, since so many classical works miss the last century or more of not only historical development itself, but also of investigative procedure and method to develop models out of that history.
Also, when it comes to Kropotkin, the standard recommendation is usually Conquest of Bread, which don't get me wrong is a decent book, but I think its popularity really tends to overshadow Mutual Aid: A Factor of Evolution. Particularly if you have passion towards the natural sciences, biology in particular. In addition to being a political/philosopher, he was also a biologist with several achievements of note. I'd recommend this book if you have any sort of inclination or fascination with studying the living natural world, as it does a great job setting egalitarianism and a world with no individual is privileged over others into a scientific context.
And if that sounds like something you're into, I'd also recommend "The Mis-Measure of Man" by my top dude Stephen Jay Gould is a wonderful debunking of things like IQ and Skull-shapes.
Zoos that are essentially wild life preservations that have some portions of that habitat visible to viewers who are encouraged to support the preserve by getting the chance to see some of the animals, those are OK i guess. But zoos that are primarily just trying to make money off of showcasing exotic animals to people are fucked obv, they should be abolished and their animals rescued and given to the former type I mentioned. (Sadly, many of them probably couldn't survive if re-wilded)