A tricky part here is that the community still needs to be followed at least once on your instance for the content to come through. I think
So if a community isn't coming through, I'd recommend these steps:
Search for the community and follow it like any other user.
Add it to a specific/bespoke list, then remove that list from home (a setting available on each list). This removes "the firehose" from your home feed.
Follow the corresponding tag as you would any other