It started after the war.
Thats a lie.
It started before, when a housemate first called her “Looney”. Some might even trace it back further to the first injustices in society, but Luna was happy to say it started after the war and so what she said stood.
There were many after the war who demanded change.
The Lupin Laws did a lot to integrate werewolves into society, to end the perception of them as the monsters they were only once a month.
The Dobby’s Deed Foundation, set up by Harry Potter, worked with S.P.E.W. to protect house elves and to, where necessary, negotiate their freedom from untenable circumstances. House elves liked to work after all. They did not like to be punished.
Luna worked with Neville to rebuild Hogwarts, and, with him, made some changes during the process.
She knew, for example, that Ernie Macmillan had been hit by a back-breaking curse and barely survived but fully intended to return to redo his final year, use of his legs or no. Luna built ramps and slides into the stairs where she could, and invented a chute one could say ones destination into, enter and be flown through the school to ones destination.
Lavender was blind in her left eye now, Luna knew, so she put up large-lettered signs to direct students. After the first week of term with all students arriving on time the Professors wondered why it’d ever been any other way.
Dennis Creevey still froze up when he saw blue spells so Luna set her whole house to finding alternative spells to use, and a way of blocking such spells from Dennis’ sight
Hermione came to her and Neville to talk about muggle-born students with issues integrating into the magical world and students with trouble learning. Neville was the one who suggested an introductory course to the wixen world, and made a muttered comment about terrible teachers and terrible teaching and something which sounded like Snape.
Luna and Hermione asked Cho and Parvati and Padma if they’d help make a study group for students of all years, and ask Justin Finch-Fletchly and Daphne Greengrass to organise muggle-raised students and wixen-raised students into buddy-pairs so they could each learn about one another’s world.
It wasn’t much, at the time, and Luna planned to do much more. But until then, she thought, changing Hogwarts was as good a start as any.
(Originally posted here on my personal. As said there I am an able-bodied person so if anything here is at all problematic in any way shape or form tell me and I will fix it as soon as possible.)