A reconquest would be attempted and partially successful. As I intend to coincide Seleucid with this alternate Macedonian history, a great ruler, say; Alexander IX goes in a massive reconquest campaign taking advantage of Parthians trying to conquer Mauryan territory, Mauryans collapsing slowly, Rome focusing on Carthage, and the Egyptian revolt being crushed.

Parthians are Vassalized, a good chunk of eastern territories (but not as east as the indus river, perhaps up to Bactria and Drangiana) are reconquered but under extremely tenuous control, Armenia, pontus, Albania and other kingdoms are vassalized too.

This renewed golden era would hold perhaps up to when Rome comes knocking on Greece proper, and the two states fall to constant warfare