Do something because you want to try.
Because you want to start a new habit, because it is a thing you might like, because you know that somebody will feel better. Do something because you are running out of time or because you have too much time on your hands. Do it because it makes sense, because it is the right thing to do, because you know you can handle it. Or perhaps to test yourself, to stretch your skills and build new muscles. Do something when you have nothing to do, when you have too much to do, when you feel down, and when you feel energetic.
But never do because you expect someone to do something in return.
That’s just not how it works.