I absolutely understand how you're feeling, I feel that way too! This year's Christmas was magical in many ways, because at least for one night everyone in my family put their problems aside and focused on being grateful for the good things instead.
There are so many ways of giving back to the world, the first thing that comes to my mind is that you could give away goods for the homeless this time of the year, it's cold, and there are many people praying for some warmth, could be a jacket, a blanket, or warm soup. You can also donate to a specific cause and make someone's Christmas the happiest; I know someone who has a gofundme page if you're thinking about that. You can write a letter for someone you know is having a rough time to help them feel better, or write letters for anyone you think deserves a smile on these holidays. I hope you have a wonderful week and a very happy new year! And happy birthday!