I would stop fixating on who is doing the most good, like some kinda top 6 listicle of Humanity's Most Positively Impactful Helpers, and just reach out to anyone who is helping.
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because help is multidimensional and we don't know what metrics you personally consider more important (there is no objectivity here), 2) maybe I'm getting hung up on a word and have misunderstood you
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I appreciate your sentiment and hope you find a worthy cause to throw in with! :)