"The war was over, the light side had won. Yet, for some reason, there seemed to be something missing in Harry's life." At the age of 20, Harry finds himself drawn to the veil of death. After falling through, he ends up back in time (in his one year old body). Harry vows to save everyone, with the help of Sirius (who has also gone back in time). No Slash.
Just as Stephen Strange is about to cast a spell to make everyone forget who Peter Parker is—he remembers reading about a risky spell long ago —one that would allow Peter, MJ, and Ned to time travel back into their younger bodies, giving them a second chance to make things right. A post NWH fix-it where Peter, MJ, and Ned time travel back to the year 2016.
Endgame Fix-it. Natasha and Tony end up in the Soul Realm after their deaths, but they aren't alone—Loki, Gamora, and Vision are in the same boat. After a strange earthquake occurs in the Soul Realm, Natasha and Tony find themselves in their past bodies, during the events of IM2. Together, they resolve to change the past and fix all their mistakes, and ultimately—stop Thanos.
Post NWH, Peter keeps his distance from everyone, believing his friends are safer without him. Unbeknownst to Peter, however, the people he left behind are suffering in his absence. When those closest to him slowly regain their memories, Peter finally realizes that both Peter Parker and Spider-man can have their place in the world. AKA a NWH fix-it for those who cried at the end.