I've been wanting to read The Deep for awhile now, but finally sat down to read it a few nights ago. It tells the story of a mermaid (Yetu) who, as the historian, holds all the memories of her people, of their trauma and how they came to be. While she is gifted, she is also extremely sensitive, and the memories are literally killing her. So when the time comes, as it does every year, to let her people remember, she decides to run and save herself, rather than take the memories back at the end of the ritual (and so die). While she slowly regains herself and her sense of self away from the memories, she becomes increasingly aware that the memories are killing the rest of her people, and so needs to decide whether to live or to save them all.
I really enjoyed The Deep. I loved the worldbuilding around where the merpeople came from (they are descended from pregnant African slaves who were thrown overboard - the idea is that in the womb, babies are not breathing air, so what if they were born of the sea and never needed to breathe air? A very interesting narrative that has roots in songs - this article talks a bit about it, as well as the idea that people would like a memorial along the Atlantic trade routes, which is definitely deserved considering how many people died along them) And the idea of holding all the trauma from generations of your people (and it wasn't just the trauma, it was their actual memories) was really interesting - as historian, Yetu wasn't really living, she was living the lives and trauma of all the people who came before her.
Definitely check it out if you have the chance (and are okay with reading fantasy)!