Romulus Augustus himself is not known to have played any significant role in politics or military affairs. He was likely a figurehead, with real power being held by Odoacer. After his deposition, he was sent to live in Campania, Italy, and his fate is ultimately unknown.
The fall of the Western Roman Empire was a complex process that took place over several decades and involved many factors, including political instability, military defeats, economic decline, and barbarian invasions. The removal of Romulus Augustus was one of the final steps in this process but did not directly cause the empire's collapse.