His relationships could also play a big role in his development. Maybe he forms a really close bond with one of the other Avengers during the war. This friendship could teach him new things, like how to better control his powers or how to be more of a team player. And if he loses this friend in the war, it could be a huge turning point for his character, making him more determined and perhaps a bit more jaded.
One idea could be that Spider - Man discovers a hidden power within himself during the Infinity War. Maybe he has a unique connection to the Infinity Stones that no one else realizes. This power could help him turn the tide in some crucial battles.
One idea could be that Spider - Man discovers a hidden power within himself during Infinity War that allows him to turn the tide of the battle. Maybe he can communicate with the Infinity Stones on a deeper level, using his spider - sense to detect their weaknesses and strengths.
With Iron Man, their relationship could grow deeper. Spider - Man could look up to Iron Man even more, and Iron Man could see Spider - Man as a more equal partner. For example, Iron Man might trust Spider - Man with a crucial part of his plan to stop Thanos.
One possible fanfic could be where Spider - Man's death is more of a sacrifice to save others. Maybe he uses his powers to hold off Thanos' minions long enough for the remaining Avengers to escape. His last moments could be filled with thoughts of his friends and Aunt May, and his determination to do what's right.
Spider-Man doesn't meet his demise in the Infinity War comics. The plot unfolds in a way that ensures his presence throughout and beyond this particular storyline.