A possible plot twist could be that Loki was actually working with Thanos all along, but faked his death to deceive the Avengers. This would change the whole dynamic of the story and lead to a new set of conflicts. Another twist could be that Loki's survival was part of a grand plan by Odin (who might not be truly dead) to stop Thanos from getting all the Infinity Stones.
One way Loki could survive Infinity War in fanfiction is through his shape - shifting abilities. He could have faked his own death by creating an illusion of himself being killed by Thanos while he actually slipped away. Another possibility is that Heimdall, using the last of his power, sent Loki to a hidden realm before Thanos could deal the fatal blow.
Loki's survival might also lead to a shift in power dynamics. In the Asgardian remnants, he could emerge as a leader figure, using his wits and magic to protect and guide them. This would change the way Asgardians are perceived in the MCU. Instead of being a broken and defeated people, they could become a force to be reckoned with under Loki's leadership.
Another aspect could be Loki's relationship with the other characters. Without Thor, he would need to build new alliances. He could form an unexpected bond with Hulk, perhaps using Hulk's brute strength and his own cunning to create a unique duo. They could then set out on a mission to retrieve the Infinity Stones from Thanos, with Loki devising elaborate plans and Hulk providing the muscle.
One way Loki could survive in a fanfiction of Avengers Infinity War is if he used his illusions more cleverly. He could have created a very convincing double of himself to be killed by Thanos while he escaped. Maybe he used his magic to teleport at the last moment to a hidden location in Asgard or even a different realm.
The plot could start with Loki's clever escape. He then realizes that he needs to find a way to stop Thanos on his own. Loki could travel to different realms to gather allies. He might convince the Frost Giants, his own people, to join forces with the other heroes against Thanos. Along the way, he discovers a hidden power within himself that was unlocked by his near - death experience. This new power gives him an edge in the fight against Thanos.
Loki could gain the ability to harness Thor's lightning. Maybe in the moment of Thor's death, some of his power transfers to Loki. This would be a huge boost to Loki's combat abilities and could make him a more formidable opponent against the likes of Thanos.
In Infinity War fanfiction, Loki can be alive. Fanfic authors have the creative liberty to rewrite the events. They might bring Loki back to life using magic or some other means. For example, Loki could have faked his death and gone into hiding, only to reappear later in the story to help the heroes fight against Thanos. His survival can add an interesting twist to the story and create new interactions between characters.
If Loki survived in Infinity War fanfiction, it could have led to a very different outcome. He might have used his trickery to deceive Thanos in some way. Maybe he could have pretended to be on Thanos' side while actually working against him. This would have added an extra layer of intrigue to the story as the other characters would have been unsure of his true motives.