Hogwarts: Oh no, I've become Voldemort!

Cyrus travels to the world of Harry Potter, expecting to be greeted by dazzling magic, but instead he replaces Voldemort's soul in the diary and becomes "Tom Riddle".
Cyrus: Oh no, I've become Voldemort!
Voldemort: Oh no, I've become a stand-in!
……
During her time in the diary, Cyrus diligently absorbed Riddle's knowledge, awaiting the opportunity for her resurrection. Then, in the summer of 1992, Ginny Weasley wrote her first words in the diary…
(Internal investment application has been approved; investors are welcome.)
Sigrún has taught at the Iceland University of the Arts as a part-time lecturer since [-] and was Dean of the Department of Fine Art from [-]-[-]. In [-]–[-] she held a research position at Reykjavík Art Museum focusing on the role of women in Icelandic art. She studied fine art at the Icelandic College of Arts and Crafts and at Pratt Institute, New York, and holds BA and MA degrees in art history and philosophy from the University of Iceland. Sigrún lives and works in Iceland.
Having learned from the mistake of writing the previous book poorly, this time I have prepared a detailed outline, strengthened the main character's storyline, and vowed not to have a bad ending!
Keywords: Hogwarts, Hogwarts, Harry Potter