Maybe hit up some good YA. It reads faster and the payoff comes sooner so it's easier to get engaged in the book (Tui T Sutherland's Menagerie series may have been written for kids but it's frigging delightful and I like to reread it when I'm stressed, ditto the Best Christmas Pagent Ever and The Enchanted Forest Chronicles)

I like to read in the bath (without my phone) because there are no other options and I'm forced to concentrate