If you create a community, please try and populate it with content. I see a lot of new communities with 0-1 posts from the mod. That’s not nearly enough to get people engaged - users are going to see that it’s a ghost town and leave.
If you have enough interest to create a community, you probably know something about the subject matter, so PLEASE add some posts (5-10 would be a good start). Maybe some questions to get people talking, even popular reposts from other sites. It sucks shouting into a void, but if you don’t do it, everyone else will also be shouting into a void.
Also please consider whether you need to create a community! When there are 100 million users of the site, there may be 1000 people who are interested in the same exact niche tabletop RPG as you, but there are <500,000 users here for now, so you’ll be lucky to find 10. Consider creating a thread in a broader community (like boardgames) until you have enough people talking in the thread that it gets messy - then it’s time to create a separate community.
Thanks for coming to my TED talk.
Crossposting is also a good way to start. For example there is community like !lorraine@jlai.lu or !lyon@jlai.lu that focus on specific part of France. They have almost no original content but someone interested on Lyon’s local story may not be subscribe to all the community about tourist, politic, urbanism, activism, fun stories and so on that publish stories about this place.