All Roads Lead to Home

Harry Potter: Boy-Who-Lived, Saviour of the Wizarding World, Defeater of Voldemort. He thought he could finally live in a quiet corner of the world with his few remaining friends and family, but destiny apparently has other plans.
After an incident with the Deathly Hallows, Harry is in a whole new world. A whole new time. But if there's one thing Harry's good at, it's adapting. Harry has never been a quitter, and that isn't changing.
After accepting that he could never get back, he meets someone destiny has tied him with, no matter what world or time.
Add in the Dark Lord Grindelwald, a manipulative but good intentioned Dumbledore, and baby Death Eaters, Harry slowly realises that he can't stay out of a war when his loved ones and home is at stake.