Any Chinese expository book recommendation ?

I'm a HSK ~5-6 learner who has changed his way of learning from just reading textbooks, to reading chinese books and highlighting the words i don't understand for further vocab expansion.
I think this way of learning has lots of potentials if you know what you are doing.
another reason I'm doing this is because I want to read something expository while learning chinese/improving my reading.
so, what expository books do you recommend for reading at this level(I have a few books already but I started to wonder if there are better options)
Do you know of any list that provides an answer?