~Fiction~
A couple of my favourite book series that I re-read from time to time are the Kingkiller Chronicles by Patrick Rothfuss and the First Law Trilogy by Joe Abercrombie. Both are well-written fantasy page flippers and are great ways to end the day (note: you may end up staying up later than intended).
Disclaimer: The third and last book for the Kingkiller series is yet to come out--it's been like 14 years lol--but I still highly recommend the series.
~Non-Fiction~
Two books that were impactful in my own self-development were books about leadership. Leaders Eat Last by Simon Sinek and Extreme Ownership by Jocko Willink. Both are written by qualified leaders in different domains. Both offer different perspectives and tools for being a leader.
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What about you? What do you suggest?