One which you've zeroed in on is "don't require heroism". We have a lot of these stories already. (Unfortunately also a lot of exciting stories of "heroism".)
The more interesting one though, is that sometimes high-impact work is "just there" to be done, if you're looking. IMO this is also really what "hero" stories are about: something goes so wrong that either people are finally forced to either look for once, or forced to bring in someone who will look.
As a senior engineer, for the past couple years I've tried to pitch parts of what I see "just there" intentionally, either before it becomes a crisis or just as a potential win. Sometimes people still don't see it; maybe they're stuck in "one year of experience, ten times" or sometimes they're just built out of stop energy. But the best way I've found to detect promising junior engineers who will benefit from mentorship is to find who does bite, and more often respond "what if" instead of "but".