"Plugins for Automatically Publishing to Lesser-Known Social Media Platforms"

"Hello, many plugins are useful for automatically posting your content on Twitter and Facebook. I want to know if there is any that can post on social networks like these: marketingops.mn.co, club-elixir.mn.co, good-stewards.mn.co, elderassociation.mn.co, onwayassociation.mn.co, mossfon.mn.co, snapped.mn.co, network-4727457.mn.co, network-84066.mn.co, live-for-less.mn.co, network-66425.mn.co, marketingops.mn.co, network-91263.mn.co, bloby.mn.co, network-91263.mn.co, nc-cricket.mn.co, bloby.mn.co, vaynernation.mn.co"

Less likely you'll find any plugin that can do that,
You'll have to create a custom script/plugin to do the work,

If it's worth, it shouldn't be as hard, especially while using python, AI making such things easier,
Or simply hire someone that would do the job

Find a freelance programmer for example

I doubt it's worth it. It looks like all UCG pages on those social networks, at least the ones on the mn.co domain, are tagged noindex, nofollow.