You do not need to leave the whole world different to leave your part of it better.

Judging your effect at world scale guarantees it will look insignificant, which is a good way to talk yourself out of the effects you can actually have. Your part of the world is a real place with real people in it, and improvements there are not consolation prizes.

Name the specific circle you actually touch, the household, the team, the street, the handful of people. Ask what better looks like there. That is the scale where your effort translates into anything.