@qnou it would be great to think about the onboarding definitely. Maybe giving the most commented post of the week to newcomers might trigger the first interaction. A monthly digest for new comers could be an option.
An old member could become the "godfather" of a new participant. Just to explain the context and strengthen the sense of community.
Also, you could set onboarding rules:
1. Comment in a post that interest you
2. Share a personal article
3. Invite a friend to the community
For me it was difficult to find the time to read all interesting content in the community. Catching up in my spare time.