The Angel in me, so to speak, says this to me
Bring rightly directed joy to people that costs something to you, this will give you more of a meaning to your life
Joy giving should be directed
Don't sacrifice something to people who laugh at you for this and think you are a weak bleeding succer, don't give to people who take it for granted, almost as a tax, don't give to people who don't make a social connection that you want to be kind, or to other people that want to fool you; if you do, then you loose your part of the trade, the meaning
Why does it give me meaning, if I direct my sacrifice to bring joy
If the sacrifice doesn't cost you anything or very little relatively speaking, then your gesture is superficial (e.g. if you make lots of money, the actual give away has to be proportionally larger), since you have to feel that you have to struggled (either as extra hours at the job, or less bought products and services for you) for there to be meaning. The struggle is the basis of the meaning (in that it packs this effort, or denail of own joy, full of emotional value) and you give this value packed struggle a higher meaning when you are kind and give this to a deserving (in your eyes) individual(s), by the simple fact that you matter to them socially and this fact you can imagine (or be told), and this gives you meaning, since you matter in this world. This also opens up you to more appreciate others who are kind and sacrifice things to you - wow, someone else cares for little me, you have traded some sacrifice for a single meaning with the potential to score the double.