B/X Known World
Right. That’s a big part of it. Self-centered focus on me the player and my character instead of the group, the campaign, the world, or the game. “I am the star” not even “we are the stars”.Heroes are the ones who survived and did the big things. You can only assess that at the end -- death or retirement.
This touches on the subject of what a "campaign" is, too. Is it a "story" about a certain set of characters, or is it a world? If the former, of course things like TPKs ruin campaigns. But if it is the latter, the story doesn't end just because some group ends up moldering bones on the bottom of a spiked pit. There are other heroes.
The heroes are the ones who live. Make the character who survives the 0-level funnel the hero. Get attached to the one who actually does something in the game. Hell, don’t even name them until they survive. They’re a random collection of numbers. It’s a game.