Intermediate Space related book

Hi everyone, I'm looking to dive deeper into astrophysics and space topics with some intermediate-level books. I've already read a few by Neil deGrasse Tyson and some other beginner-friendly ones like "A Brief History of Time" by Stephen Hawking. They've been great for getting the basics, but now I'm seeking recommendations that are a bit more complex and technical – without just repeating the same concepts over and over again. Ideally, books that build on those foundations, maybe with more math or more complicated topics.
Any suggestions from fellow space enthusiasts? Fiction with strong astrophysics elements would be a bonus too! Thanks in advance!