I'm fairly focused on China (studied China in university, speak Mandarin, live in China, read about 50 books on/about China during the past 10 years).
While there are plenty of books that can give you a general feel or a broad understanding of some trends in society (Age of Ambition: Chasing Fortune, Truth, and Faith in the New China, China in Ten Words, China's Millennials: The Want Generation), and there are a few books regarding specific parts of the government/policy (The Party: The Secret World of China's Communist Rulers, Out of Mao's Shadow: The Struggle for the Soul of a New China, Wealth and Power: China's Long March to the Twenty-first Century, When A Billion Chinese Jump: How China Will Save Mankind Or Destroy It
), I don't know of many books that are focusing specifically on authoritarianism. I suspect that there are quite a few journal articles from political science scholars who focus on Chinese government/governance.
One assumption I have here is that you only/primarily would read in English. If you can read in Chinese, then there is a far more vast swath of literature available from Hong Kong and from Taiwan about China.
Books I’ve read that relevant to things like the possibility of stable and/or global totalitarianism
Novels:
One point in favor of 1984 and Animal Farm is that Orwell was intimitely familiar with real-life totalitarian regimes, having fought for the communists in Spain etc. His writing is more credible IMO because he's criticizing the side he fought for rather than the side he fought against. (I mean, he's criticizing both, for sure--his critiques apply equally to fascism--but most authors who warn us of dystopian futures are warning us against their outgroup, so to speak, whereas Orwell is warning us against what used to be his ingroup.)