What is the best way to maintain the performance of my Ford Fiesta's engine?

I have noticed a decrease in the overall performance of my Ford Fiesta's engine. What are some tips and advice on how to maintain and improve its performance? I want to make sure that my car performs at its best for as long as possible.

Regularly change the oil and air filters to keep the engine clean and running smoothly. Consider using synthetic oil for better engine performance.

Check and replace spark plugs as needed to ensure proper combustion and fuel efficiency.