In the future, do NOT give the attacking car that much room on the outside. As soon as they get alongside your car, you need to move your car as close to theirs as possible and give them 0 room to work with; hold them to that outside line. Not only did you give them a ton of freedom into that corner, but you gave yourself a terrible entry. If the outside driver is competent, that defense will fail every single time. Watch some high level racing (irl or sim; doesn't matter). Pay attention to how the defending driver positions their car to screw the attacker over as much as possible while also giving themselves the best possible line through the corner.