It's great that you're spreading the word but this must be done strategically, not just dumping a bunch of posts at once on random communities especially since they are all from your own blog.

Keep it to a slow trickle of info and not only will people be less annoyed but they also will have repeated, organic interactions with Meshtastic over a longer period instead of it being forced upon them all at once with spam.

The way you're doing this they will disregard your posts and think the MT community is annoying and not worth engaging with.