1) You might need to get out in your community more. 2) And-or you might need to broaden your definition of like-minded.
I’m not being flippant here.
Some of the biggest blowups and betrayals are among communities of supposedly “like-minded” people. The whole concept of “like-minded” is very prone to turn into chasing something that doesn’t exist.
Meet your neighbors. I don’t have a dog, but a lot of people find like-minded people just by being out walking their dogs. I certainly find a lot of like-minded people by being out in my garden. When they see me out, they start talking. I could not have looked at them and been able to tell, “Oh, that’s a person who shares my views about gardening and community!”
Neighbors can be online neighbors as well.
Also, being an introvert is no excuse. I am an extreme introvert despite being a public speaker and teacher. Introvert can be quite good at finding people, because we’re not as able to do it by the more obvious channels.
The other point, regarding broadening your definition of like-minded. Everyone wants clean water, and everyone wants a good life for themselves and their family. If that’s too broad a definition for you, experiment with narrowing the definition.
And if you’re not finding your (close-enough) like-minded people, experiment with broadening the definition until you do. Not finding them is not an option. We can’t live without community.
What works for me is to define what constitutes like-minded (for me). A lot of times it’s situational as opposed to a constant.
Sometimes like-minded might just be everyone who’s concerned about a certain issue in the neighborhood. Could be overpolicing, could be local government spraying herbicides, or over-trimming trees, etc. And maybe we sit together and drink coffee, or maybe we get on our Facebook group, and talk about what to do next.