Limit what you buy and use
Reuse old items instead of buying new ones
Recycle plastics and cardboard and papers in recycleable bins
Use your voice to speak out against in justices
Go to or make fundraisers to raise money for organizations that support and help good causes, like building schools or providing medicine for others
Donate old phones, technology, clothes, etc.
Pick up trash even when walking down the road
Make the neighborhood look nice and inspire more positive change!
Reduce the amount of single-use plastic you consume
More ideas can be found on the United Nations website pages on the SDGs, linked here.