I feel this is a super like... individual question, that sorta depends a bit on your goals?
I talked to a friend once who wants to work in non-profits, something that had never occurred to me as a like, long-term goal, and his response was "I want to do something that matters, you know?" I was honestly blown away. That's the sort of thing that's hard for me to imagine doing if it's not out of some sort of guilt -- "oh I should be doing some kind of charity, I should be doing some good in the world" -- rather than a genuine and fulfilling aspiration. But here he was, excited about the chance to do the kind of work he really wanted to do.
I talked to another friend of mine, who said they didn't want Power or Fame or Influence and I admitted there's a part of me that does sort of want to be famous. "What for?" they asked, because they assumed that by this I meant I wanted a sphere of influence, and they confessed that they'd always assumed that "fame" and "power" were synonyms -- anyone who wants fame obviously wants it for the power and influence. I talked about how I had silly daydreams about getting a comic made into a movie and going on talk shows, of people being really interested in my insight into my stories.
"So you want engagement?" they asked.
"What else is fame?" I replied. "It's five million people caring about you."
So like, for my first friend, work that helps others, work that "matters," was part of being a somebody. For me, part of being a somebody is being seen and cared about.
But then there's another layer of that, because one single person can have conflicting feelings. Regardless of how much I value it, I don't really believe fame and influence is a true measure of worth. I also want to be a kind person, and I try to constantly remind myself that this, too, changes the world. Little moments of respite for friends are worthwhile even though they don't change everything. And I believe this, even when I don't always feel it! So I have what I Feel, where something inside me craves acknowledgement and attention as a method of becoming a Somebody, and what I Believe, what I have decided, which is that even insignificant acts of kindness contribute to the world and make you Somebody.
And then there's another piece to this too, which is that not everyone wants to be Somebody. Some people genuinely don't care, and the idea of being a Somebody or a Nobody doesn't keep them up at night. They want to be happy, fulfilled people, but they don't find that worth and that fulfilment in being a person of any Significance. They just want to make a good place for themselves and the people they care about. And then if you asked them, "are you a Somebody?" they would say "No, I'm Nobody, but I'm happy!" and be perfectly content with that.