Maybe they could use the Quantum Realm not just for time travel but also to create some sort of energy wave that counteracts the effects of the Snap. The characters in the fanfiction could figure out a way to harness the unique properties of the Quantum Realm, which is already a bit of a mystery in the MCU, to fix what Thanos did.
Well, in this fanfiction scenario, if Wanda could reverse the snap, it would be a game - changer. Vision was a key part of her life, and her love for him could fuel this power. But it wouldn't be easy. There would be a huge energy cost, and she might have to sacrifice something in return. Maybe she'd have to give up some of her own life force. And then there's the matter of Thanos. He wouldn't just stand by and let her undo his 'work'. There would be a massive battle, and the outcome would be uncertain.
Perhaps they could have used time travel to team up with alternate versions of themselves. So, the Avengers from different timelines could combine their powers and knowledge to come up with a better plan to stop Thanos. This would involve not just fighting him physically but also outsmarting him in terms of his knowledge of the Infinity Stones.
One way to 'fix' the situation in a fanfiction could be to have Loki's faked death in Thor: The Dark World be more thoroughly investigated by Thor. If Thor had been more suspicious and dug deeper, he might have uncovered Loki's real plan earlier. This could have led to them working together more effectively against Thanos in Infinity War, preventing some of the tragedies that occurred.
It's not an easy fix. Comics might approach it by introducing new plot elements or alternate timelines to change the outcome.
Doctor Strange is often a popular character. Given his knowledge of the mystic arts and his ability to see different futures in the movie, it makes sense that he would play a key role in time travel fanfiction. He could use his powers to manipulate time more precisely.
In this kind of fanfiction, Peter Parker might use time travel to prevent the events of Infinity War. Maybe he could go back in time to warn the Avengers about Thanos' plan earlier. This could lead to a completely different outcome, like they could gather more powerful forces or find a way to stop Thanos from getting all the Infinity Stones in the first place.
In a fix - it fanfiction, Thor and Loki could start by having an honest conversation. Loki could reveal his true intentions and fears to Thor. This newfound honesty could strengthen their bond and make them a more effective team against Thanos. Instead of the constant mistrust between them, they would be united and support each other throughout Infinity War.
If Iron Man time - traveled in an Avengers Infinity War time travel fanfiction, he might use his tech - savvy skills to outwit Thanos much earlier. Maybe he could prevent the Snap from ever happening by going back and sabotaging Thanos' plan to collect the Infinity Stones.
One interesting concept could be alternate timelines. For example, characters might travel back in time to prevent Thanos from getting all the Infinity Stones in the first place. This could lead to a completely different outcome in the war.
One way to improve the plot could be by making the time travel rules more consistent. For example, if the hobbits can travel back in time, clearly define the limitations and consequences of such travel. This would add depth to the story and prevent plot holes.