The lonely Hikigaya Hachiman wants to become the king of mystery novels

"Teacher Hachiman, you have published so many mystery novels before you are 20 years old, and each of them has sold more than one million copies. You are respected as a once-in-a-century mystery novel genius. You have such a steady stream of ideas. Where did it come from?”
"I don't think I'm a genius. I just use the time other people spend partying and falling in love to write." Hikigaya Hachiman replied.
"But Mr. Hachiman, there are always some rumors saying that you are always surrounded by many girls."
"Well, actually those are not rumors, but I don't think it will affect my writing."
New to the book, please give me some advice.