I tried to get it out to as many channels as possible, all the ones I knew about -- the common Lisp subreddit, discord, irc, the fediverse, telegram cl group, and matrix. I also sent two reminders in those places :) I'm sorry if I didn't reach you though. What channel did I miss?
http://planet.lisp.org/ is the canonical lisp revival place to announce lisp related things. a very small subset of lispers hang out on places like reddit, discord or telegram
Reddit-wise, you posted on /r/Common_Lisp but not /r/lisp, which has a lot more subscribers and activity.
Add the mailing lists for the main implementations.
You could even have posted to comp.lang.lisp.
I was just curious, where the survey was posted. It seems I missed it, when a link to it was posted it here on HN.
In any event, I thought it would be worth documenting such for any survey.