Maybe he uses some powerful magic spells that he has learned secretly. For example, the Patronus charm could be used to fend off the Dementors which are the main guards in Azkaban. He might also get some unexpected help from his friends or some mysterious characters within the fanfiction world.
In the fanfiction, it could be that there is a flaw in Azkaban's security system. Harry Potter discovers this loophole and manages to exploit it. He might have found a way to bypass the magical barriers or the surveillance of the guards. It's also possible that he has a special magical item that gives him the ability to break free. Maybe it was given to him by someone who wants to see him escape for some important reason.
Well, in this fanfiction, Harry Potter could break out of Azkaban through a combination of things. First, his strong willpower might play a crucial role. The Dementors feed on positive emotions and Harry's determination not to be defeated by them could give him an edge. Second, he may have formed an alliance with other prisoners who have knowledge about the prison's layout or some hidden passages. And finally, his own natural magical talent, which is extraordinary, could be enhanced in some way within the story to help him overcome the obstacles in Azkaban.
A practical answer is Chapter 198, because it turns the idea into a concrete scene. The chapter opens with He wrapped his arms around himself and stepped back half a step, eyeing..., adds pressure through All these years I've been busy taking care of the little ones, hardly..., and ends on How is.
A practical answer is Chapter 183, because it turns the idea into a concrete scene. The chapter opens with Seeing that he held a blue ball identical to Su Yinwan's, Jiang Yan..., adds pressure through As for the leftover person—" Saying this, he looked towards Jiang Li, "You..., and ends on Hadn't.
If you want the clearest chapter reference, go to Chapter 169. Early on, Everyone: "What?!" Seeing the shocked and bewildered expressions on their...; later, the chapter leans on This is a transformation show after all; you can't rely on Jiang Li for....
A practical answer is Chapter 166, because it turns the idea into a concrete scene. The chapter opens with Only after everyone in the small courtyard had left, did Zhao Lang stride..., adds pressure through Fans can't bear to watch anymore.], and ends on However, after interviewing the villagers.
Look to Chapter 171 for the clearest answer. It begins with The afternoon rain stopped and started again, making the air even more..., keeps building through A few people simply moved the dining table into the small courtyard,..., and lands on They weren't any big shots;
Chapter 199 is the strongest chapter-level answer because it starts from Damn, the production team is actually being so generous this time, giving... and follows through on You knew all along?" Zhao Lang adopted a contemplative look before curving....
Look to Chapter 172 for the clearest answer. It begins with Not only Shu Yan, but the entire internet was shocked when they saw Su..., keeps building through Damn, what brand of make-up is Su Yinwan using?, and lands on Where's the chaotic scene I was anticipating?.
If you want the clearest chapter reference, go to Chapter 175. Early on, Wen Jiaojiao's eyes nearly rolled back into her head.; later, the chapter leans on If you know you're sorry, why did you take so long and even redo your hair....
The best chapter pointer here is Chapter 170, "This Family Will Fall Apart Without Jiang Li". It opens with Watching the two who had long remained silent, the PD shifted his position... and closes on [Didn't the other guests also do farm work in the rain all morning, isn't....
A practical answer is Chapter 167, because it turns the idea into a concrete scene. The chapter opens with By the experimental field, Qi Tianyu was quite helpless as he watched Wen..., adds pressure through I'm not familiar with the others;