Stop negotiating on monthly payments. It signals to the dealer that you have no clue what you're talking about and prompts them to take advantage of you. If you're leasing worry about the total purchase price of the car, lease % rate, how many kilometers/miles you get to drive every year, and what the wear and tear/damage policy is at return time. The monthly payment will fall in line based on that.

https://forum.leasehackr.com/t/audi-q5-e-premium-plus/545930

https://docs.google.com/spreadsheets/d/1NtalLzQJhH1yS6sp95XcK5FFA_EXLspAy1MG0HbIF3s/edit#gid=1208308308