First, thanks to all of you who share recommendations in this kind of topics. I found great books here.

I'm gonna recommend an author I never saw over here and that I found interesting.

Peter Kingsley. He's an academic who studied classical Greek philosophers and what he calls "the origins of western civilization" and he's also a mystic.

While reading him sometimes I think he may be mad, and at other times I think that his explanations make a lot of sense. His central idea (or what I got from him) is that at the origin of western civilization and its fundamentals there were mystics, not intellectuals. He includes among these mystics Parmenides and Empedocles. Then intellectuals gained popularity and took control of the discourse and diminished and ridiculed the real role of Parmenides and Empedocles and their teachings.

As a starting point, his shortest book "In the dark places of wisdom" is a very good introduction of his ideas and would allow a reader to know if he wants to read more or not. As a second book I think that "Reality" is a good choice.