I noticed that some of the mods here are also the mods of r/experienceddevs. That subreddit is quite active. Perhaps it would be effective to have automoderator throw a sticky on every post there, just saying welcome to r/ExperiencedDevs, please follow the rules, etc and at the bottom: Did you know we have a Lemmy community? With a link here.
That is absolutely not the case. I have posted many links to lemmy there. The only thing I still do on Reddit is discussion related to Lemmy and fediverser, there is nothing being blocked and I afaict am not being blocked.