Depends on the type of community. I am the PS5 community creator. There is constant news available for discussions but you have to be consistent and patient. For other types of communities it is probably harder to even generate content. It helps to make friends with other mods also if your community has "neighbors" so to speak. For me that would be other console communities and gaming communities.
If you're gonna start something like c/birdswitharms you're probably gonna have a harder time gaining traction.