• How were/Were the triumvirates successful?
• How did the republic collapse? (Internally)
• Is it portrayed accurately in movies and tv?

Ideas:

• road building techniques
• study into the gods and culture
• what they ate
• how taxation worked
• legal status of citizens and other people

• How did the inflating bureaucracy contribute to the "fall" of Rome.

• What did Romans understand of economic inflation and how was it combated?

• Religion in the life of a Roman: how did they perceive and believe what we understand as their religion?

I always liked u/sunagainstgold’s advice on choosing paper topics. In your case, a first step might be identifying the course reading you found most interesting and then working from there to identify a topic around that.