This train runs with a low occupancy and rests idle for ~12hrs at KZJ. On the other hand, the cities of Vijayawada and Guntur need a new dedicated train to Mumbai. Hence, it is better to extend this train to Guntur via Vijayawada as it increases the occupancy and provides a good alternative connection to Mumbai from the Capital City of Andhra Pradesh.
Introduce a new train between Guntur and Mumbai.
Extend this train to Guntur.
I have a different idea (Please comment if you have one.)