You are very near the border.
In the early morning thru the border (very dirty place) and someone find you.
No exist TOURIST or LUXURY BUS only LOCAL BUS.
Trip take 9 hours.
Try a Jeep for 300 Indian Rs. May be sometime you are in 3 peoples, sometime in 15 peoples on the Jeep.
Very long transfert.
Second way is take a bus to Gorakhpur and then train to Varanasi