Working my way through Don Quixote; currently about 2/9 of the way in.
I hope you have better luck than I did. I loved
Man of La Mancha, but when I tried to read
Don Quixote, I got about as far as you did before giving up!
At the moment I'm reading
Valperga: The Life and Adventures of Castruccio, Prince of Lucca, which is Mary Shelley's take on the life of that medieval Italian politician that Machiavelli so loved. I'm reading it mostly for my love of Mary Shelley.
Before that, I read
My Dear Hamilton, which I definitely recommend to anyone interested in learning more about Eliza Schuyler Hamilton or the revolution and American founding from a female perspective.