@pvonhellermannn
I wonder if the lack of "local" servers could be an issue? My local Greens are centered in a single big town and are very active from there but I can't see them individually having a lot of traction in the wider Fedi; whereas if there was a local server along the lines of (possibly inactive, I'm not sure) epsom.social they could have more of a singular voice.
I see Zack does have some syndicated posts via a bot which is fine, but I also see a lot of other regional green parties and some multinationals are actually actively engaging here.
Perhaps starting at a local party level might push awareness up to the group level?