It may help if there was a newbie forum, where a sticky emphasizing the Wiki and some help videos was in place. Called “Start Here” or something.
That might head off the common, repetitive questions?
Maybe even a few stickies in that forum, or a FAQ post.
As currently the same questions are asked again and again.
Separately, it might be an idea to dedicate a forum to controllers as this is one area its tricky to predefine in RetroPie – maybe it would help build more and more configs for known controllers. It could also be used to explain in a sticky what files are read for controller settings.
If newbie questions and controllers were out of the main forum, maybe that would thin it out a bit?