I'm right there with you fam, I've been getting into theory lately and its making me realize that my brain is not in the shape for political theory. I find that it's like lifting weights though - you have to start with something easier like YA fiction, then graduate to adult fiction with complex themes and political undertones, then onto modern theory, then finally classical theory, skipping tiers if you feel like it. I could barely get through the Communist manifesto until I got back into reading after a long break with The Hate U Give, and after I finished that I blew thru the manifesto in half the time and remembered more.