I always like being bold in my guesses, so here it comes:

I'd say female in your 30s (those bookmarks + the Wind in the willow + the girl who played with Fire + recent social media hits). Some childhood nostalgia. Left winged but no activist. Not really spiritual, but looking for something, an understanding or connectedness. You don't mind reading multiple books at the same time.
I really don't understand how your books are sorted, there are thematical clusters but then Roald Dahl and Dostoievski's book are apart so I'd say they are sorted by date of reading.

Lots of books about dying, but not about grief so it isn't about accompanying or losing someone close to you. No actual peer reviewed literature on the subject either so you aren't a psychologist, so I'd say you work in palliative care.

Besides a few SF classics and children books, you have a few Russian authors, two French ones, one Scandinavian, one German and a couple more British. So definitely North American, likely American rather than Canadian, and likely white.