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On a side note, a lot of GMs are active in ways that are invisible. For example, virtually nothing that I do is broadcast or requires players to show up for it. I tend to make quests, create/decorate new areas and try to make automated events that don't need a GM to be behind the wheel.

Thats the point, You are one of the few that can spend time thinking on a solution for this playerbase coz i know u already meditated on those auto quests/pvm events, and there are alot of solutions that you can bring to IN since you are a Creative person, a Tool of god...
There are solutions already like random events, but has u can see only a few are looking for those events, we have to think about something addicting, some system that could also email people once its ON for eg...

“Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.” - Albert Einstein