The only further adjustments I think that ARR needs after very recently pushing four players through it is:

Adjust the 1-15 stories to be a bit more compelling. Not sure how, but the path to those dungeons just isn't quite enticing enough.

...

and that's it. The only other problem my players ran into? Toxic players who want to rush through everything and yell at new players for not having good enough gear/tanking to the wall in their first time/whatever excuse. It's to the point that they almost want to refuse to do content because of these players. The game isn't really the problem. The players are.