I think there was a post here or news article detailing that due to high prices and competition from road services [which go straight to Ayodhya instead of taking a slight detour], the GKP-LKO VB wasn't able to properly fill it's 8 coaches even, despite the inauguration of the Ram temple. It's only a matter of time they will either extend it or convert to an ICE [with fully electrified tracks, a reverse ICE will easily fill passengers bound both for Ayodhya and Gorakhpu].