The 15 minute break was to go to the candy store next door. If course that was when we had a hodge podge of self built and repurposeded halls, nowthey are remote from added attractions.
To keep people in they need reasonable attire standards and a few social events. And no droning meetings; WT could be 15 minutes, Sunday sermon 15 minutes. Announcements could be put on JW Publisher where they belong to start with. I think tge "safety" meeting for toilet scrubbing takes 15 minutes, and wear a reflective vest and hard hat.
Add internal ministry instead of policing