If you like introspective sci fi, you could try Mary Doria Russell, 'The Sparrow' and the sequel 'Children of God'. She seems to know everything there is to know about humanity. The story line is about the first interstellar voyage to Alpha Centauri and what they find there, it's a story about religion as much as about sci fi but both books I found engaging.
In science, there is a book I found engaging, 'The Trouble with physics' by Lee Smolin.
It kind of bemoans the tattered remains of string theory, that it has been around for decades but not getting anywhere. Very good history of Relativity and such. I just found a critique you might also find interesting:
I recently got into a spat of reading sci fi again, went through the entire Radiant series of Catherine Asaro, she is one heavy duty woman for sure, Phd in physics, owns a biotech company, is a ballerina, and has written a slew of soap opera sci fi books. She posits a time 5 thousand years ago when some alien civilization for some unknown reason captured a bunch of humans from that time, transported them to another planet in our galaxy but also back in time which allowed the kidnapped people to build up a powerful interstellar civilization, they find out about Earth and the fun starts. She makes a case for a kind of electric field empathy/telepathy but with real science behind it, like using the inverse square law of EM radiation, where you have to be close to the other person to get the empathic or telepathic signals. Good read, couldn't put the books down, lots of sex