It's a public repo under a Facebook org; it's bound to be picked up on Reddit if it hasn't been already.
Personally, HN would be my go-to if I had a project to show and for which I was hoping for some high-quality collaboration.
If by 'reaching directly out' you mean contacting specific people, then it shouldn't be a public repo. Like I said, it's under a Facebook org, of course others will find it.