Make another person’s day. You would be surprised how much positive impact a small act can have on the person you are kind to along with the impact it has upon yourself.
As stated earlier, you can ask someone if they need help. You can also tell them how great they are, write them a secret note (my girlfriend loves finding these in random places), take someone out for a meal, and so on.
It doesn’t have to be a big thing. It just should be something that will brighten their day.