You seem to explicitly exclude the moment he decided stop being a sycophant and save Morgiana and the little girl at great cost to himself (nearly dying in the process, and crushing debt from throwing the wine at the flower monster), which ultimately added additional motivation for him into entering the dungeon (a much higher debt to pay back).
He had already gotten past a similar hurdle. He already gained confidence to do the right thing instead of the easy thing. This entire arc has been Alibaba backsliding, weighed down with his past. Now he is nearly as bad as he was in episode 1, the only difference is he isn't prostrating himself before his half-brothers.
New sets of characters aside, Alibaba's character development hasn't gone anywhere since the start of this arc. It's gone in reverse. So yes, it is starting to get dragged out.
edit: Furthermore, his line in that very episode was, "It's still better than doing nothing and living with regrets!" which is exactly what he's been doing these recent episodes.