When I Became The King Of Vampires Vampire King

There was a voice in his head which made his life miserable right from his childhood. He had no friends and became a shut-in.

"Obey my command and you shall get everything you want." The voice tried to persuade him.

One day, he decided to quit his life and before doing so, he thought of giving the voice one more chance and did what the voice instructed.

"You shall be called Tristan, from now."

The voice said and disappeared from his head. When he opened his eyes, he was in a new world. And he was the King of Voçhters(Vampires) in this world.

But there was also a warning along with this new life and powers.

"DON'T WAKE SLISK UP!"

With the chance he got after being reincarnated as the King of Vampires.
What will he do? What troubles await him? How will he alone change this world?