Encourage other people to be their best.
Cheer them on when things get tough.
Cheer with them when they do well.
Don’t be aggressively pushy. Nobody likes a bully even if you think it’s for their own good. Be the positive strength in their efforts.
Personally, I strongly encourage everybody to be someone else’s Pocket Cheerleader. You never know what kind of impact you’re having on them. You may see the results in a few months, a year, or ten years from now. What is important is that you believe in them. Trust me, they will never forget you and you will grow from the experience too.