I actually don't remember the start of Autistics Speaking Day (I'd just started my freshman year of college), but I've read about it.
I've participated a few times.
I helped with the Tumblr for it, I think 2014-2016?
But as time moves on, the ways people engage in communities have changed. Yahoo groups were before my time. I began engaging in the age of blogs. I saw #AutChat start. I think we're in the age of social media, now, more so than stand-alone blogs.
I'm not sure that's a good thing, but I think it's true. Facebook groups are where I'm most active, now.
I'm still speaking. Just... not usually orally, and not usually here.
(It's also relevant that I've been writing in places that aren't blogs or social media, but that's more the academic side of things than the everyday.)