I have mentioned this book before, but have now finished it, looking at the Kindle version, which is much cheaper than paper: Roy Barzilai, The Testosterone Hypothesis: How Hormones Regulate the Life Cycles of Civilizations:
https://www.amazon.com.au/Testosterone-Hypothesis-Hormones-Regulate-Civilization-ebook/dp/B00WT870N6
The book deals with themes dear to my heart, such as that Western Christian civilisation is collapsing all around us, yet little is being done to halt the decline. Sure, there are some dedicated people, but we are talking about the uprising of millions of people.