As muddy water is best cleared by leaving it alone, it could be argued that those who sit quietly and do nothing are making one of the best possible contributions to a world in turmoil.
All you have to do is say "yes." Don't make some big project out of it. Don't make some big deal out of it. Just say "yes." You don't even know what it means to say "yes," but you say it anyway. You'll never know what it means to say "yes," but you do it anyway. Freedom and Love arise when you die into the unknown mystery of being.
Don't ever forget that you're a citizen of this world, and there are things you can do to lift the human spirit, things that are easy, things that are free, things that you can do every day: civility, respect, kindness, character.
Freedom is not worth having if it does not connote freedom to err. It passes my comprehension how human beings, be they ever so experienced and able, can delight in depriving other human beings of that precious right.