There are some hidden gems out there. You could also try joining Danny Phantom or Jeff the Killer fan groups on social media platforms. Fans in those groups often share their favorite fanfictions. Sometimes, the really good ones are not the most popular but are loved by a small group of dedicated fans who can point you in the right direction.
I'm not sure about specific titles off the top of my head. But you can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'Danny Phantom Jeff the Killer' in the search bar and look through the results. Read the summaries and reviews to find ones that seem interesting.
Unfortunately, I can't directly recommend specific fanfictions. However, when you're searching, look for ones that have a high number of views and positive reviews. Also, if a fanfiction has been updated recently, it might be a sign that the author is dedicated and the story is likely to be good. Keep in mind that everyone has different tastes, so what might be great for one person might not be for another.
The best chapter pointer here is Chapter 62, "There is Something Strange". It opens with Sitting on the edge of her bed, she pondered for a while before lifting... and closes on Jiang Li reached in, pulled out a piece of paper, and slightly raised her....
A practical answer is Chapter 73, because it turns the idea into a concrete scene. The chapter opens with Director Sun, tongue-tied, finally managed to squeeze out a sentence,..., adds pressure through Her favorite food is rouge goose, her favorite amusement is Dancing Gun,..., and ends on Despite.
A practical answer is Chapter 36, because it turns the idea into a concrete scene. The chapter opens with But soon, people began to question the authenticity of Jiang Li's bare..., adds pressure through Qi Tianyu, catching the signal, instantly turned to the duo upon entering..., and ends on After.
A practical answer is Chapter 60, because it turns the idea into a concrete scene. The chapter opens with What's with Jiang Yan, treating his own sister Jiang Li like this?" "He..., adds pressure through Jiang Yan, are you that lacking in confidence?, and ends on And in traditional characters?".
If you want the clearest chapter reference, go to Chapter 75. Early on, The ordinary people in the livestream were all stirred up by this scene.; later, the chapter leans on [Did you see that, did you see that?.
Look to Chapter 57 for the clearest answer. It begins with Lu Xingchao's numerous fans were stunned., keeps building through Holy shit, what's up with God L?, and lands on I'm saying, big bro, can you at least reply to me?.
If you want the clearest chapter reference, go to Chapter 70. Early on, So, under the curious gazes of everyone, Jiang Yan strutted up with his...; later, the chapter leans on He didn't even take off his sunglasses before he started reading into the....
If you want the clearest chapter reference, go to Chapter 57. Early on, Lu Xingchao's numerous fans were stunned.; later, the chapter leans on Holy shit, what's up with God L?.
Chapter 64 is the strongest chapter-level answer because it starts from Chixia Village lay in tranquil slumber. and follows through on He'd been a host for so many years; he was used to it..
If you want the clearest chapter reference, go to Chapter 55. Early on, Su Yinwan hadn't expected that, in just one day, Jiang Li's reputation had...; later, the chapter leans on Yet she was clearly the wretched cannon fodder of this book..