I was thinking about this after I replied to you - “allegorical” is really quite a specific word, where some fictional thing or person “stands for” a more generalised thing, and is often called by its name. So in the Bible, “Dame Wisdom” is like that.
As you say, “Myth” can’t really escape the aura of “fiction” it has acquired.
Maybe the least loaded term is “metaphor.” I like that because it is more what language always is in any case, and the Bible author is just doing it is a slightly different way to us. That leaves it open to discuss what he’s actually trying to say.
Edit: I should add John Walton’s concept of “archetype.” In this some individual person or event “stands for” its successors. And so he distinguishes by word studies where “adam” in the account means “mankind”, where it means “this particular man” and where it means “this man paradigmatic of all men.”
When I corresponded with him (before he published the “Lost World of Adam and Eve”) book he stressed that ANE archetypes usually existed, or were believed to have existed. Hence the earlier discussion in this old thread (I think) that the Wright Brothers were archetype flyers in that ANE sense, whereas Phileas Fogg is not.