I didn't even know there was an International Non-binary Day!
About two decades ago, I opted out of binary gender and attempted to take on zie/zir pronouns. I really wanted to see non- and other-genderedness be recognized. I kept with this for quite some time despite a lot of social pushback. Still, after a while my anxiety got the better of me. I settled on she/her. But I definitely gave up on gender internally, and I would say as much. ("You're a woman, right?" "Ennh... *shrug*")
At some point within the last few years I saw the rise in folks using they/them and decided it was time to try again. I've settled in comfortably!
So, thanks to all you other non-binary types out there! Even if individually we couldn't all keep up the struggle, our collective efforts are showing real motion... and some of us who'd nearly given up are optimistic again. (And helping push!)