Well, perhaps one interesting plot point could be the character getting a chance to redo a crucial event in the wizarding world. For example, if it was a character like Harry, he might get to relive the night his parents died and try to change the outcome. Another could be a different character being given a second chance to make amends for past wrongs, like Draco Malfoy getting a chance to befriend Harry and the Gryffindors instead of being their rival.
One plot point could be that a character gets a second chance at a relationship. For instance, if there was an unrequited love in the original series, in this fanfic it could be rekindled. Let's say Luna Lovegood had feelings for Neville Longbottom but it never went anywhere. In this 'Second Chance at Life' fanfic, they might get a chance to explore their relationship. Additionally, the second chance could involve a character getting to change their Hogwarts house. A Slytherin who always felt out of place might get the opportunity to transfer to Ravenclaw and experience a whole new side of Hogwarts life.
In this fanfic, a possible plot point is that a minor character who died in the original series is brought back to life and given a second chance. They could then use their new - found opportunity to uncover secrets that were previously hidden. Maybe a Hufflepuff student who was overlooked in the original story gets to be part of a big adventure this time around. Also, the concept of a second chance might lead to new magical abilities being discovered as characters explore uncharted territories of magic in their second go - around.
Maybe in this fanfiction, Harry is given a second chance to save Sirius. He could figure out a way to reach Sirius before he goes to the Ministry of Magic. He might use some new spells or magical items he discovers in his second chance to break through the Ministry's defenses and rescue Sirius in time.
In 'Harry Potter second chance fanfic', a fascinating concept is a second chance for the House rivalries. Maybe Gryffindors and Slytherins getting a chance to understand each other better. For instance, Draco Malfoy could be given a second chance to not be so influenced by his family's dark views. This could lead to him becoming friends with Harry and his friends. Also, characters like Luna Lovegood could have a second chance to share her unique knowledge more widely, which might help in solving some of the mysteries in the wizarding world much sooner.
Maybe in this fanfiction, Harry's second chance at life allows him to prevent certain tragedies. For instance, he could figure out a way to save Sirius Black much earlier. He might have a premonition about what's going to happen and use his knowledge from his first life to change things. This would completely change the dynamic of the story as Sirius could play a more active role in Harry's life and in the fight against Voldemort.
In this type of fanfiction, a plotline could be Harry having a second chance at life and realizing the power of his choices. He might choose to focus more on his studies and become an even more powerful wizard. He could also use his knowledge from his first life to form alliances that he didn't before. For instance, he might befriend some of the Slytherins who were on the fence about Voldemort. This would give him an edge in the fight against the Dark Lord and also change the dynamics of Hogwarts.
One idea could be that a character who made a big mistake in the original story gets a second chance to fix it. For example, Peter Pettigrew could be given a second chance to not betray the Potters. Another plot could be a student who failed a crucial exam getting a redo and changing their academic fate. Maybe Neville could have a second chance to stand up to the bullies earlier in his Hogwarts years.
One interesting plot idea could be that a character who made a major mistake in the original story gets a second chance to redo a crucial event and changes the course of the wizarding world. For example, if Peter Pettigrew had a second chance, he might not have betrayed James and Lily, which would have a huge impact on Harry's life and the fight against Voldemort.
There are 'Second Chance' fanfictions where Harry has a second go at his fifth year at Hogwarts. In this scenario, he is more prepared to deal with Umbridge. He might also use his second chance to better train Dumbledore's Army from the start, making them a more effective force against the Dark Arts. Some fanfictions even have him getting a second chance to change the final battle, making it less costly in terms of lives lost.
Often in these fanfics, the reincarnated character tries to change the fate of some characters. They might be determined to save Sirius Black earlier or prevent Cedric Diggory's death. This alteration of the original plot creates a whole new set of challenges and adventures. Additionally, the way they handle their identity as a reincarnated person within the wizarding world can be full of drama. Do they keep it a secret? How do they deal with the memories of their previous life while living as a new character in the Harry Potter universe?
It could be Harry Potter himself. Given all the hardships he faced in the original series, a second chance would open up a whole new world of possibilities for him. He could use this chance to prevent some of the tragedies that occurred, like the deaths of his friends or mentors.
The plot of 'A Chance at Happiness' could involve Harry Potter encountering a magical object or person that changes his life for the better. It might also have him solving a mystery or overcoming a long-standing fear to achieve that happiness.