Thanks, that makes it a bit clearer.
There is a member preference setting for “send summary when I don’t visit” that could be used as a reminder. But that isn’t dependent on trust level.
And I know there are a couple of plugins that send reminders eg.
Moderator Extension
Discourse Assign
But those are for staff, not non-staff members.
I vaguely recall seeing discussion about some type of “not now, remind to get back to it” feature, but I can’t remember or find where that was. An existing Feature request topic?