You have a Twitter account?
Maybe it's time to publish a tweet to other Ham buddies to tell that there is a cool Mastodon instance focused on radio? Don't you think so?
Yes I have an active (hamradio bubble) Twitter account Jean-Pierre. I regularly "promote" mastodon.radio there.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!