Everyone wants lively communities, yet few people are willing to post.

Lemmy isn’t big enough to have 1% of users be able to provide content to a passive 99%. If you want more of something, you need to make it happen. People naturally slowly become more willing to engage when there is activity, but there need to be people making a conscious effort to be the early adopters. If you want posts, make posts. It does much more good than asking why there are no posts.