Well, one way to find good '500yrs to wait fanfiction' is to join relevant fan communities. For example, if it's related to a particular TV show or book series, there might be dedicated forums or subreddits. People there often share and discuss their favorite fanfics. You can ask for recommendations and they might point you to some really interesting stories within that '500yrs to wait' concept.
Chapter 482, "Someone Might Need Me", is the clearest early answer because it turns Hua Country's situation into a concrete plot event. It opens with Other people caught a glimpse of Zhao Lang's cold and stern face and...
Chapter 763, "It must be Jiang Li who tied her up!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event.
Chapter 825, "This method is absolutely not feasible!", is the clearest early answer because it turns Xu Mei's situation into a concrete plot event.
Chapter 366, "The Safety Lock Got Flattened?!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. The chapter gives readers a real answer by opening on You're finally out!" Xiao Wu saw Jiang Li and the others from a...
Chapter 321, ""Great Benefactor" is Jiang Li?!", is the clearest early answer because it turns Zhang's situation into a concrete plot event.
Chapter 545, "Kiss Me", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Truth or dare, I still choose dare!" He just didn't believe it, Jiang...
Chapter 833, "She’s Also a Quick Transmigrator?!", is the clearest early answer because it turns Quick Transmigrator's situation into a concrete plot event. Early on, [It's the Yu Family and that Fengshui Family, the Li Family, who....
Chapter 828, "Can I Take a Picture with You?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In the hall, there remained only Jiang Li and their group, along with...
Chapter 454, "Are these two people crazy?!", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. Early on, Shang Shuyue felt that following Jiang Li was the best decision she.... By the end, Alright, next we'll go for training!" Yu Li: ?.
Chapter 486, "So It's All Set Up, Right? Then She Will Set Up Too!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Hearing Jiang Li's words, the audience in the live stream was also...