I get irritated when I check out a community and there is no content on it.
First off, I get it if it's a fresh community and you don't have anything yet. But if you're community is over an hour old and has nothing on it... Why would I join it?
If you want your community to grow, post content as soon as possible, after it's been created. Otherwise, you're missing out on potential subscriptions and posters.
ALSO
If you find a community you like and subscribe to, post something! That's the best way for it to grow and for you to see new content from it. Nobody wants to be the only poster in a community.
Be the change you wanna see! But yes I feel you man. I created a small app to post content from reddit to a community (manually) to populate some of my community a bit while waiting for other users on Lemmy.
Actually, I do. That's how all three of the communities I mod for, started out. One is doing well now, getting new content a few times a week, another only gets new content pretty much when I post and the last one is pretty dead.