One option could be extend it till agartala on eastern side and Jammu Tawi on other side.
There could be some slip coaches to this train ,like one of them going to KanyaKumari from lucknow, while other slip coach going to Vascodagama from Mughalsarai. There could be many more slip coaches to this train.
There should be connecting service to this train at various places [Typically junction point- Like at SSM from ARA side or at MGS from PNBE side and so on