Hello, thank you for taking the time to post your question!
There are a variety of factors that can cause a country’s ecological footprint to decrease, including things like technological innovation (sustainable energy, green manufacturing, etc.), shifts in consumer behavior (things like opting for more sustainable transportation methods like public transit and cycling or choosing plant-based diets), or governmental policies and regulations (policies that promote a circular economy – minimizing waste and maximizing resource reuse – are particularly effective here).
I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)