I finally picked this back up a couple of days ago. I tried Easy Endless and was just bored out of my mind. Normal endless was a little bit better, but there's a lot of garbage in there.
I added a bunch of high-end level makers to my follow list, and for some dumb reason I thought the best way to get back into Mario Maker was to play games from one of the best players in the world. One of his levels taught me shell jumping, but I've put 2-3 hours into a level that I thought looked relatively easy (comparatively) and managed to make it about 2/3 of the way through. I'm slowly getting better but I should probably just put in some more general practice time first.