One idea could be a story where Miles Morales has to team up with an alternate version of himself from a dimension where he never became Spider - Man. They have to overcome their differences and learn from each other to stop a new villain that is threatening all the spider - verse.
In Spider - Man Into the Spider - Verse story, it begins with Miles Morales. He's a young boy with his own set of insecurities and dreams. When he gains his spider - like abilities, he has to learn to control them quickly. The story takes a wild turn when the multiverse is involved. There are various versions of Spider - Man, each with their own unique styles and personalities. For example, there's a Spider - Man who is a noir - style detective. Kingpin's actions disrupt the balance of the multiverse. Miles, along with the other Spider - People, has to face many challenges, not only in fighting Kingpin but also in understanding and accepting his new role as a Spider - Man. It's a story full of action, humor, and heart - warming moments as Miles grows into his new identity.
It all starts when Peter Parker gets bitten by a radioactive spider. This gives him amazing powers like super strength, the ability to climb walls, and a 'spider sense'.
It changes the original story by introducing the concept of the multiverse. In the normal Spider - Man story, he's mainly dealing with threats in his own city. But in the fanfiction within the MCU, he has to face threats from different universes. This makes his challenges much bigger and more complex.