The way you lead your own life and how you treat others, both in person and online, regardless of their position, does have a discernible impact on the world, even if it's on a much smaller and more local scale than grander efforts.
Being mindful and sincerely striving to have the fruit of the Spirit - love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control - does make a difference. What is inside your heart radiates outwards. The simple acts of being polite to the grocery store workers and thanking them, being considerate with your actions and thoughtful of how they impact others, that matters. Taking responsibility for yourself, making sure to clean up your own messes figurative and literal, pay what is owed on time, complete your tasks to the best of your ability, and fulfill your obligations and commitments with a positive attitude - all matters.
How you behave and how you treat others in significantly influences how others behave towards you. Every action has an opposite and equal reaction, so you need to think about your actions. Albert Einstein once said: “I speak to everyone in the same way, whether he is the garbage man or the president of the university.” That's wise. Showing that respect to each person you encounter is being the change you want to see in the world.