DND_Reborn
The High Aldwin
I think one of the issues in 5e that can make it boring is, counterintuitively, how fast you level up. If you run any of the published campaigns, you level up every 2-3 sessions. You barely have time to learn what your latest set of bells & whistles does before you get a new feature. Consequently, you can't really spend a lot of time invested in any particular place, and any attempt to make the party do so feels like you're just delaying the next level unnecessarily (WTF? I don't get XP for this!).
By reintroducing AD&D's leveling schedule, I found that sprawling dungeon complexes work much better, since the party doesn't level up and out of them after six rooms, and the time spent at a given level is long enough that we stay much more focused on the adventure rather than thinking about what feat or spell to take next. Yes, it means we're only at 9th level after 2 years, but we've had far more fun with this than any published campaign.
Hmm.. that is an interesting point. The character in the OP is for CoS, and we have leveled 5 sessions out of 7 I think. Now, we play long sessions, about 10 hours each, so for normal 4-5 hours sessions, it would equal out to every 2-3 as you say.
So, are you making it so 2000 xp or so is needed for level 2, etc.?
Now, our main game has had 36 sessions (I am the note-taker, so I keep track) in the last 16 months. Again, long sessions, so you could double it for the more regular 4-5 hours sessions, so about 72 sessions. We are 12-13 levels, so averaging about 6 sessions a level. At that pace it did feel more like I had time to develop and adjust for new features, etc.
Still, I don't know how that will help with the fact that subclass features are not fitting to the character.