Need a book to get me back into reading

I’m postpartum (7weeks) and used to be a huge reader. I have picked up about 7 different books and just cannot concentrate or enjoy them. Some genres I usually am drawn to are mystery, thriller, nonfiction etc. I’m open to trying different genres as well if it’ll get me back into it.

Some of my favorite books are: Misery, anything Agatha Christie, say nothing, born a crime, and books like them.

I’m open into trying fantasy. I love watching fantasy (LOTR, game of thrones, etc) but have never read it.