Sounds like a good thesis - the evolution of vampires in literature. I thought this article was interesting.
https://the-artifice.com/vampires-in-literature-themes/
For very recent books, there is the Clairmont family of vampires in Deborah Harkness's All Souls Trilogy. When Silas mentioned there were dark things in his past, it was the vampire Matthew Clairmont from this series that popped into my mind. Obviously this series was written after
The Graveyard Book but as mentioned it's a recurring theme in literature. The television series adaptation of the first book,
A Discovery of Witches, is currently showing on AMC and BBC America. It has a great cast of well-known actors. I watched it earlier this year on Sundance NOW.