People frequently talk about doing something major. They want to solve world peace, fix the environment, cure world hunger etc.
Why not start small? Go out of your way to do something nice today. Help someone carry their groceries from the store to their car. Pick up some litter as you walk down the street. Thank a person for doing a good job.
Very simply, do something nice today and if you really want to make a difference, do something nice every day. Small things can make a BIG difference.
Have a great day!