Don’t write weekly updates if it’s going to be a repetitive exercise.
Measure your updates. Are they successful in bringing people back to the community?
Only write updates that members want to read. Updates that brings those who haven’t visited the week before up to do with development.
Use a gripping headline. Give a clear call to action. What do members need to do right now in the community? What opinions do they need to give? What actions do they need to take? What events are coming up?
Don’t call your weekly update a weekly update. Give it a community-themed name. Perhaps the {CommunityName Weekly}. Treat it as a publication people pay for.
Most importantly, put something in the update that members can’t get in the community.