Why didn't Afghans conquer the Maratha territory after the third battle of Panipat?

Jun 2019
Afghanistan originally

we literally decimated Marathas and destroyed their backbone so badly that they never thought about crossing satluj again. but sadly despite great Afghan victory at the battlefield shah baba only asked for control over punjab instead of going all over North India and Conquering Delhi, Ganagatic plains and Bengal like other Afghan empires like Ghoris, Khiljis, Lodis etc. Mughals were pawns of Marathas so i dont see any reason for keeping them as Sultans of Delhi.

we had control over large chunk of North India after victory as we can see from the map i linked below, we missed a golden opportunity to recreate glory days of Ghurids by taking over Iran in west to Bengal in East.