what do 你 think atsuya needs to do to get girls?

Be where they are. Literally, Atsuya only has to be somewhere to get a girl. Just like Shirou. No matter where they go, girls would swarm them. They don't have to change one thing about them. They're perfect!!!

Nothing...That's why whoever is gonna be his girlfriend has to keep an eye on him...Same goes for Shirou, too..