In such a fanfic, perhaps Harry discovers some long - hidden, damning secret about Dumbledore. Maybe it's related to Dumbledore's past actions with Grindelwald. Harry, being the honest and justice - seeking person he is, feels compelled to expose this secret, which then leads to Dumbledore being fired from his position at Hogwarts.
It could be that Harry is influenced by some dark magic or a powerful enemy who manipulates him into believing that Dumbledore is a threat. So Harry starts to dig up dirt on Dumbledore, real or fabricated, and manages to get him fired. For example, if there was some misinformation spread about Dumbledore misusing school funds for his own personal gain, Harry might believe it and push for his dismissal.
One possible plot could be that a new power emerges in the wizarding world, a group that has different ideals from Dumbledore. They manage to convince Harry that Dumbledore's way of running Hogwarts and his overall influence is harmful. Harry, being young and impressionable at times, sides with this new group and provides evidence, real or not, that causes Dumbledore to be fired.
Chapter 599, "The Weather has Cooled Down, the Merchant Should Go Bankrupt", is the clearest early answer because it turns Shang Shaobai's situation into a concrete plot event. Early on, Shang Zhenhe continued, "Shaojing is really out of line, leaving a....
Chapter 920, "College Entrance Exam Results Inquiry", is the clearest early answer because it turns Wan Huixia's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Outside the nursing home, Meng WanZhi anxiously waited in the car for...
Chapter 504, "It's me, Gu Yu", is the clearest early answer because it turns Si Yue's situation into a concrete plot event. It opens with Just a short distance away, a group of people gradually approached... and closes on You, who are you?" This question voiced the puzzlement of Gu Qiang....
Chapter 818, "A New Village Amid Shadows and Brightness", is the clearest early answer because it turns Dean Yu's situation into a concrete plot event. Early on, Wanzhi stared in shock, her eyes wide open, "What you said....
Chapter 508, "Isn't this the wild boar raised by Jiang Li?!", is the clearest early answer because it turns Zheng Xun's situation into a concrete plot event.
Chapter 494, "Unrequited Love Turns Into Enmity", 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 reality, Su Yinwan had not noticed Bai Lu's presence at all.
Chapter 538, "You Won't Get Angry No Matter What I Ask, Right?", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. Early on, Su Yinwan couldn't ignore Jiang Cheng's unusual behavior any longer....
Chapter 487, "Found a Kindred Spirit?", is the clearest early answer because it turns Zhuola's situation into a concrete plot event. The chapter turns that into something concrete by moving from Shang Shaojing noticed everyone's weary expressions and, after a...
Chapter 472, "The Stream Dried Up?!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 607, "Confrontation Head-On", is the clearest early answer because the buildup finally cashes out in a real clash. It opens with Several boats hadn't yet crossed when they were directly capsized. and closes on they had found a place to hide as soon as they landed ashore..