There's a 'GotG Crossover Fanfiction' that involves crossing over with the Star Wars universe. In this, the Guardians find themselves in a galaxy far, far away. It plays on the similarities between the two space - based settings. The characters interact in really interesting ways, like Rocket having a sort of rivalry with Chewbacca over who's the better furry sidekick.
One popular gotg fanfiction story could be 'Guardians of the Galaxy: New Beginnings'. It explores the backstories of the characters in more depth. Another might be 'The Guardians' Secret Mission' which takes them on an adventure not shown in the movies. And there's also 'GotG: Allies and Enemies' which focuses on their relationships with other characters in the universe.
One popular gotg fanfic could be those that focus on the backstories of the characters. For example, stories about Rocket's origin before he joined the Guardians. Another might be fanfics that explore potential romantic relationships within the team, like Star - Lord and Gamora's relationship in different scenarios.
Their relationship would likely deepen. The impending arrival of a baby would bring them closer together on an emotional level. They'd have to communicate more about their hopes and fears for their family. For instance, they might have long talks about what kind of values they want to instill in their child.
Another plot could involve them preparing for the arrival of the baby. They could be seen shopping for baby supplies in different alien markets. Quill would be clueless about most things, while Gamora has a more practical approach, leading to some comical situations.
You can start by looking on fanfiction.net. It has a large collection of 'gotg peter fanfiction'. Just use the search bar and type in relevant keywords like 'Guardians of the Galaxy Peter' and you'll find a bunch of stories.
The fanfiction 'Peter's Redemption' is quite interesting. It delves into Peter's past mistakes and how he tries to make up for them. It's a more character - centric story that really explores his growth as a person. There are some really emotional moments that make it stand out among other fanfictions.
First, really understand the characters. Know their personalities, like how Drax is very literal - minded. Then, come up with an interesting plot. It could be something like a new threat to the galaxy that only the Guardians can stop. Also, use the unique settings of the Guardians of the Galaxy world, like different planets and alien species.