Most new online communities fail because members don’t return to keep discussions alive or get involved in new ones.
Most of the time that’s because new members haven’t developed the habit of regularly visiting the community or members simply forget that your community exists.
Prevent this from happening by:
1. Making sure that all members receive an email when someone replies to a discussion they started (or they’re involved in)
2. Making sure that all members receive an email when someone posts a new discussion topic.
Most community software comes with this functionality but by default it typically requires members to opt-in.
Change this to being opt-out and you’ll see a big improvement in levels of activity and engagement.