How can one reach the epitome of altruism?

Umm, hello! :) in short, alturism is the belief in or practice of disinterested and selfless concern for the well-being of others. I have been nurturing and developing kindness and compassion for years, and Im really happy with my heart's evolution (: Even the longest path starts with one step, so I think I will make me resolve as hard as stone! This is why i want to know how one could possibly reach the epitome of altruism, be completely and utterly selfless, yet still be happy? o: thank you very much!(:
How can one reach the epitome of altruism?
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