What was a major factor in the decline of the Byzantine empire?

There were several major factors that contributed to the decline of the Byzantine Empire, but one of the most significant was the constant warfare and military conflicts that drained the empire's resources and manpower. The Byzantine Empire faced frequent invasions from various enemies, including the Arab armies, Seljuk Turks, and Crusaders, which weakened the empire and led to territorial losses. Additionally, internal conflicts, political instability, and economic struggles further contributed to the decline of the Byzantine Empire.