Couple of suggestions
I almost took advantage of the recent great Bundle offer, however there was something missing i needed, the families course. I'd be happy to purchase a Mega Bundle 4 which included Roofs, Walls and Families if one becomes available with a great discount.
Also, a course on parameters in Revit covering all aspects of the very unintuitive, clunky and overly-complex way Revit deals with them would be very useful indeed. Having come some distance on the Revit journey this is still an area I struggle to get my head around, no matter how much I read and watch videos on.