You aren't obligated to finish every book you start. It's okay to rage-quit in the middle sometimes. Some books are just written terribly or the subject just isn't as interesting as we first thought. You can always come back to it later or try someone else's take on the subject.

May I recommend some David Graeber. He was a leftist and anthropologist who had a way with words

non fiction books make me want to kill myself

I usually feel the same. A few notable exceptions I have found:

• [Salt: A World History)] (https://www.markkurlansky.com/books/salt-a-world-history/) - the history of salt is way more interesting than you would think.
• [The Mother Tongue: English and How It Got That Way] (https://en.wikipedia.org/wiki/The_Mother_Tongue) - English is a damn weird language.
• [A People's History of the United States] (https://en.wikipedia.org/wiki/A_People%27s_History_of_the_United_States) - a much more accurate and honest history than the whitewashed version that public schools teach.

There are more non fiction genres than biographies and self-help

I like True Crime. Or how-to's... learning about a subject. Science is great. An easy source of interesting non-fiction is https://arxiv.org/ . ;-)