How to Improve Performance on My Audi A4?

I've noticed that my Audi A4's performance has been lacking lately. What are some ways I can improve its performance?

Regularly change the air filter and oil, as dirty filters and old oil can significantly affect the car's acceleration and power.

Check and replace spark plugs if necessary, as worn out spark plugs can lead to misfires and reduced engine power.

Have the fuel injectors cleaned or replaced, as dirty injectors can cause a decrease in gas mileage and engine performance.