Making a community and expecting everyone else to do the work for you isn’t how these things usually work, after the first few months of the service anyway. You gotta have the people that want to make the content first, which usually means you need to do the initial posting yourself to get the ball rolling.
This is why we get so many created communities with a handful of subscribers and no posts. It’s not the idea that makes a community, it’s the posters. The content creators.
Internet communities generally need to be led from the front, not from the rear. It’d be like starting a new business but not wanting to do any of the tasks yourself.