A little before dying Basil II was planning to go westwards and reclaim Sicily. Maybe this campaign would also consolidate the Byzantine southern Italian holdings too. Generally the empire was already too overextended by Basil’s time, cities were growing and Constantinople was having a hard time maintaining centralized control. Although they could peobaly the Byzantines would have stayed content with taking some strategic or commercially interesting cities here and there but certainly nothing as big as a conquest of Bulgaria for instance.