You could go the route of replacing the speakers yourself for better ones.
Not the greatest idea on a leasing car. Also not necessarily an upgrade in the first place without coding them – and obviously, adding a sub or centre speaker is impossible without coding.
All things that really aren’t that great an idea in a leasing car.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.