Why not create a solo version of each of the dungeons in the game, with reduced rewards?
I prefer to play with friends and family, so while I do enjoy groups, I almost never look for random strangers to play with.
The people I do play with, aren’t always available, so it’s rare that I ever get to play a dungeon (I have 6 chars, 1 80, 1 60, and the rest 40+) and I’ve only played a dungeon once this entire time.
If dungeons had an alternative solo mode, I’d at least get to experience them when my friends are too busy to play.