For the rest of your life to be as meaningful as possible, engage in spiritual practice if you can. It is nothing more than acting out of concern for others. If you practice sincerely and with persistence, little by little, step by step you will gradually reorder your habits and attitudes so as to think less about your own narrow concerns and more about others' - and thereby find peace and happiness yourself.
When I talk to audiences about the size and age of the cosmos, people often say, "It makes me feel so insignificant." I answer, "The bigger and more impersonal the universe is, the more meaningful you are, because this vast, impersonal place needs something significant to fill it up." We've abandoned the old belief that humanity is at the physical center of the universe but more come back to believing we are at the center of meaning.
Given the scale of life in the cosmos, one human life is no more than a tiny blip. Each one of us is a just visitor to this planet, a guest, who will only stay for a limited time. What greater folly could there be than to spend this short time alone, unhappy or in conflict with our companions? Far better, surely, to use our short time here in living a meaningful life, enriched by our sense of connection with others and being of service to them.