If you want an interesting place to do outreach for Racket,
`/r/learnprogramming` has almost a million subscribers, and a search
suggests that questions about Racket (and criticisms) tend to go unanswered:
https://old.reddit.com/r/learnprogramming/
https://old.reddit.com/r/learnprogramming/search?q=racket&restrict_sr=on
https://old.reddit.com/r/learnprogramming/search?q=htdp&restrict_sr=on
You can answer things, and point documentation, packages, etc., and also
suggest that all the action is on `racket-users`.
I was reminded of `/r/learnprogramming` when it was mentioned as as a
venue for sneaky influencing, in this:
https://www.nemil.com/musings/hack-an-engineer.html
You can also promote Racket there in non-reactive ways, with posts and
such, but don't take the sneaky bits in the article above as
prescriptive, and repeat the mantra: Don't Be Evil (Really).