Revive Rome: Wait! Why not make the empress fall in love with me first?

In the year 241 of the 6th era, Constantinople was in turmoil.
Emperor Constantine personally lead his army, which was completely annihilated. The pagan empire, riding on the wave of a great victory, annexed the entire eastern territory of the empire, and its military might pointed directly at the capital.
The 17-year-old imperial princess Theodora ascended the throne in crisis, facing what was already a terribly damaged realm.
Rome was about to fall.
………………..
The wheels of fate spun wildly as a transmigrator appeared on the streets of Constantinople.
“According to the original plot, it was only a matter of time before Constantinople would fall.” he pondered.
“Perhaps I should first whisk away the empress.”
(The book is categorized under game fantasy worlds, set in a magically altered Middle Ages, and another title is ‘I Really Can’t Lead This Team’)