Asuming your driving line through the corner is correct.

Change only one setting at a time in small increments

From more to less influence

• Decrease traction control - slip
• Increase front ride height
• Decrease rear ride height
• Increase front splitter angle
• Decrease rear wing angle
• Increase rear anti-rollbar stiffness
• Increase rear spring stiffness
• Increase rear slow bump and front rebound damper stiffness
• Decrease rear tire toe-in
• Increase differential power locking
• Increase differential pre-load

Generally if a car is understeering out of a corner the weight is shifted too much or too quick over to the rear. To counter that, the rake of the ride height can be increased or the rear suspension stiffened to not allow the weight shift rearward as quick. Additionally by increasing the differential power locking and/or pre-load can help with rotation out of a corner.

Additionally to help with the exit rotation out of high speed corners, reduced rear or increased front wing will help move the aero balance forward and induce more oversteer out of the corner. To introduce a bit more instability of the rear, the rear tire toe-in can be decreased as well.

Check the telemetry, or be mindful during driving if the traction control is cutting in on the exit and try reducing the Traction Control Slip setting which will allow for a higher slip angle on exits.