Hi Tracy – I have built and run a number of CoPs on Discourse. Generally CoPs focus on one particular practice (e.g. Community Management) rather than practices in general. Having a laser focused use case (and therefore audience) is important.
You’ll hopefully be pleased to hear that this is a long way from accurate. There are many thousands of communities run by small orgs and individuals.
What kind of challenges are you struggling with specifically? I’m happy to help.