How to troubleshoot a malfunctioning air conditioning in an Audi A5?

I have noticed that my Audi A5's air conditioning is not cooling as well as it used to. How can I troubleshoot and fix the issue?

Check the refrigerant levels in your car's air conditioning system. Low levels could be the cause of improper cooling.

Clean or replace the air filters in your car, as dirty filters can restrict airflow and decrease cooling efficiency.

Make sure the condenser and radiator in your car are clean and free from debris, which can block airflow and hinder cooling.