I often feel unsettled at this time of year. It's a new year and that makes me want to change something, do something different, a time for a fresh start kind of thing.
When I was about 40, I discovered Urban Fantasy books, basically books set in the real world that contain aspects of fantasy, such as mythological creatures (vampires, werewolves, witch, fae, etc.) and the stories revolve around coexistence or conflict between humans and these beings, and other changes to city life. The books are not always set in current times, they can be set in the future or the past, real or imagined. In the past I would have dismissed these books as childish, but I was so wrong. It's adult fiction. We're not talking about black cloaks, wings or pointy hats. The characters look human most of the time.
We enjoy fiction because of the author's skill at writing about the characters and the world they live in, so if you're looking for a change try reading books by some of these authors -
Ben Aaronovitch (Rivers of London series)
Patricia Brigg (Mercy Thompson series)
Jim Butcher (Dresden Files series)
Kim Harrison (The Hollows series)
Benedict Jacka (Alex Verus series)