There are so many things you can do to engage your audience, this is just a short list:
1) Write a daily post about your progress
2) Ask your members for their advice
3) Offer to help one new member each day, in a post
4) Do a weekly live training call
5 Do a weekly 5 day challenge right inside your group (just print, in your posts, not live on video)
6) Feature a "top member" each day of the week
7) Ask members for their hottest questions, get the other members to vote, and then answer the questions . .
and this is just the tip of the iceberg
any other experts want to weigh in here and add to this list?