Uprated dampers or a full decent coilover kit would help.
Anti-lift kit
Polybushing
Alloy wishbones and or hubs
RS3 top mounts
Anti roll bars
Lightweight wheels
Lighter brakes
Any of the above will help, I would go with dampers/ coilovers first and do the top mounts at the same time as they're probably worn anyway. Then rear anti roll bar and start trying to reduce unsprung weight.