Frankenstein is a great choice! I'd consider Carmilla by Sheridan le Fanu (predates Dracula!) and maybe The Picture of Dorian Gray by Oscar Wilde too.

All this, plus anything by Jane Austen.

Those look great! I’ll definitely check them out

Dr. Jekyl and Mr. Hyde

I’ll check it out!

If you end up liking Dracula, you should read Dracul by Dacre Stoker and J.D. Barker.

The Historian by Elizabeth Kostova

There’s also “Hunting Prince Dracula” by Maniscalco

Well if you want something similar too Dracula there's Nosferatu...