The protagonist reincarnates into the comprehensive novel, becoming a magic broom in the world of Harry Potter, and Riddle knows about it.

Answer 1

It might not be exactly what you need, but I would recommend a novel that is most relevant to your description."Harry Died the First Time" is a light novel by the author, the Mountain Man in a Bottle.

Reid traveled to the world of Harry Potter, but he accidentally killed Harry. Voldemort ruled the wizarding world, and the Dark Age descended. The non-pureblood wizards were hunted down and killed. Reid looked at the devastated world and decided to change everything he had caused. This was a book that you thought was easy, but it was actually a hot-blooded work. This is a book full of all kinds of ideas, so please remove your Occlumency and enter another timeline of the wizarding world.
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HP Enters the Magic World was a fantasy-modern magic novel written by the author, A Ray of Sunset. The general plot of the novel was:

[Magic Modification + Everyday, Dislike to Be Careful] Exploring the essence of magic, pursuing the origin of the world, let us approach the world of magic together.
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The Life of Darksnake's HP was a fantasy and modern magic novel written by the author. The general plot of the novel was:

The audience felt the same way, so they might as well write it for fun. This was also a story about crossing into the HP world.
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"A Hogwarts Magical Healer" was a light novel written by the author, Rampage Submarine. The general plot of the novel was:

Sherry Malfoy! A Malfoy mixed-blood had become a descendant of the ancient method of making the resurrection potion. However, it was not difficult for him to find out that the two great demons waiting to be resurrected had their eyes on him.
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HP Doujin: Reversal was a light novel by author Kayne. The general plot of the novel was:

Harry Potter Doujinshi novel series, the main character Draco Malfoy, not the Harry Trio, not Gryffindor, not Old Deng, and definitely not Voldemort! He intended that the reason why the female protagonist seemed to be wearing a book and actually transmigrated was unknown in the early stage. After the female protagonist transmigrated, she would use some golden fingers to reverse the direction of some characters in the original work. Dear friends who like Harry Potter, don't miss it when you pass by ~
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The Planeswalker in Marvel was a fantasy-alternative fantasy novel written by the author, Drunken in Madness. The general plot of the novel was:

The new book,"Encountering an Unauspicious Beast at the Beginning", hopes that everyone will like to rely on their parents 'inheritance. Pig's Foot began to practice magic, and an accidental operation allowed him to obtain the ability to enter other movies and television dramas. In the world of mages 'apprentices, he had learned real spells. He was able to stop time and make Loathsome Loathe stare blankly until it started to doubt its life. In Harry's world, he had to tame dementors as his slaves and make them fight in the Battle of New York... Harvest the formula to evolve into a god in Percy Jackson's world... In the end, he unknowingly completed the quest to collect the Infinity Gem and opened the door to go home.
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The White Demon King of Hogwarts was a light novel by the author, Hardy the Great. The general plot of the novel was as follows:

Lov Moen, who had mastered the Academic Genius Point System, wanted to show off his skills, but his life plan was disrupted by an owl email. Moving stairs, talking portraits, castles that hid countless secrets... The mysterious and gorgeous magic world opened its doors to him. Behind the door was a lively and kind little witch, a kind and lovely old man, and a Dark Lord who had lost his humanity. The Sorcerer's Stone was the beginning of the dream, the Chamber of Secrets was the witness to everyone's friendship, Azkaban was the beginning of darkness, the Goblet of Fire was the arrival of darkness, the Order of the Phoenix brought regret to everyone, the Half-Blood Prince was Snape's confession, and the Deathly Hallows was the cruelest reality. However, there must be a better ending, right? "Tom Riddle, stand trial!" The light from the tip of the White Lord's wand illuminated the Dark Lord's twisted face. Everything would be protected or…redeemed.
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"Subverting Hogwarts" was a light novel by the author, Kedaya. The general plot of the novel was:

How could a Muggle do well at Hogwarts with a fake wand? What kind of sparks would the combination of the Daoist Nine Words Mantra and Western magic produce? How could he become the strongest prophet that everyone believed in by relying on the mysterious divination of the East? How could he surpass the Ollivander family's thousand years of wand-making skills and unlock the black magic wand technology? A young Taoist priest inadvertently pushed open the door to magic, and the ancient traditions of Hogwarts were overturned. P.S. Taoist spells are only used as a support for magic.
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HP Magic Biography was a fantasy-modern magic novel written by the author, Luo He Luo He. The general plot of the novel was:

The new book,"The Wizard's Marvel Journey," welcomes everyone to move on. This is a collision between the Harry Potter system and the Marvel world. It has already written millions of words!
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Professor of Magic was a fantasy and modern magic novel written by AFK. The general plot of the novel was:

There were many students in the magic academy, but what about teachers?
Here, I'll tell you the story of a magic professor who traveled to another world...