Well, personal growth of the characters is a big theme. Harry, for example, has to transition from being a hero in a war to a normal (well, as normal as a wizard can be) member of society. Relationships also play a huge part. We see how Harry's friendships and family relationships evolve in the post - Harry era. It's also common to see themes about the legacy he leaves behind, how his actions continue to shape the wizarding world.
One common theme is the rebuilding of the wizarding world. After all the chaos from the battles, fanfics often show how Harry and others work to restore order and make things better. Another theme is the exploration of new magic. Since the main threat is gone, characters can focus on discovering new spells and magical artifacts.
In 'after harry fanfic', the theme of new beginnings is quite prevalent. This can be new relationships, new jobs for the characters, or new magical discoveries. Also, the idea of facing new, different kinds of challenges. Instead of fighting Voldemort, they might be dealing with political unrest in the wizarding world or problems within Hogwarts itself. Another theme is the passing on of knowledge, like Harry teaching the next generation about what he's learned from his own adventures.
Chapter 846, "Locked up for 6 months!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event.
Chapter 38 is the strongest chapter-level answer because it starts from Jiang Li had also observed the girl who had just entered. and follows through on He Yun coldly turned his head and continued to maintain his aloof persona..
Chapter 21 is the strongest chapter-level answer because it starts from Jiang Li's clear and logical explanation had everyone stunned in place. and follows through on But the implications could be different..
Chapter 801, "This Elder Sister Is So Smart", is the clearest early answer because it turns Meng Xuezhi's situation into a concrete plot event. The chapter gives readers a real answer by opening on Buchen is quite diligent, he even knows how to tidy up his own...
Chapter 809, "Specially Made for You", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Listening to the cries from inside the house that sounded like a pig...
Chapter 912, "Identical Four Pillars of Destiny?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, But the repeated blows made Wan Huixia's husband lose his confidence....
If you want the clearest chapter reference, go to Chapter 13. Early on, Sensing that something was off with Jiang Yan, Jiang Yan dismissed the...; later, the chapter leans on What on earth do you mean?" Ignoring him once again, Jiang Li shifted her....
Chapter 798, "How to Be a Dad? You Don't Even Care About Your Child!", is the clearest early answer because it turns Great Aunt's situation into a concrete plot event. It opens with Jiang Bufan sniffed hard and took a step back.
Chapter 831, "Brother, who do you like the most?", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Just as Jiang Shixu finished washing up and was getting ready to...
If you want the clearest chapter reference, go to Chapter 21. Early on, Jiang Li's clear and logical explanation had everyone stunned in place.; later, the chapter leans on Jiang Yan had wanted to defend Su Yinwan since his sister's temper in the....