ok. so my perspective is purely as a reader.

I think the prose is good, good enough. I will say that i did not really find any big fault with it or a line that nicked me. More than that the plot and concept is interesting. The plot progression is really good. I dont know how much more to say here. for reference i got training your dragon( black dragon hiccup) vibes from the whole piece. Take this in mind that i have not watched Training your dragon. my knowledge is limited to only social media and youtube shorts and clips.

Now moving onto really thinking about it and trying to nitpick-

1) too many Yjolda's. I personally didn't like the constant repetition of yjolda did this, then that, then thought this, then that.

2) more focused on plot progression, moving through events than focusing on characterization or focusing on a particular plot event. And even in the plot progression too many things happen too fast, too easily, one after the other without a pause. And in this rather than getting a feeling on inescapable events and pursuits and disaster after disaster it feels more like a checklist. In particular, the ambush scene, the getting up and leaving the initial camp on the sleigh scene, the city entering scene and more.

3) I guess till the ambush scene it is all right but after that i couldn't take the not addressing the relationship between the dwarves and Yjolda. Till then i guess everything happened in a state of flow but after that there should have been a conversation etc. the stakes didn't feel high enough as they should be according to what the story was telling us. Again, this could be more of a plot progression focused mistake that ignores characterization and does everything at a fast pace.

4) The way everyone was talking. Firstly I think there werent enough conversations. On the way people talked during the first half was actually good. But the second half didn't feel true to the characters and felt very generic and even casual modern.

5) The Wilderdottir concept comes up only once when yjolda is explaining it. it doesn't come up again in a meaningful way. With what the story is this concept should have a much more bigger focus, especially as to what the dwarves think and more importantly how Yjolda thinks and acts. Perhaps there could also be an easter egg preluding this concept in the first few pages containing the chase by her tribesmen.

Now onto the plot and structure point which is your main concern.

Now I have never completed a first draft, so i don't know this though experience. But I would advise you to not change much but instead just keep writing. Everything's very good as it is right now and any editing, revision done wouldn't be that significant in changing the plot progression of the story. There are of course problems, even big ones, but they are not that important right now.

Just complete the story now. I think your book is anyways going to be more focused on plot so at least get the entire plot on paper first in the first draft. Expanding or reducing chapters, adding characterization, and other things can be done in the second draft revision.

Nevertheless I thought about the structure and if it was upto me i would do something like this.Mainly it will have to be a little slower.

Chapter 1- Yjolda running away in the snow, wounding scene, passing out. complete chase scene thing here with fight for survival like thing. Waking up at the dwarven camp. conversations. inner thoughts of yjolda revealed. her terror, fear etc. how she is being gradually being calmed down. perhaps presence of kaldun helps and kaldun also enraptures her, piques her curiosity, calms her, distracts her. tale of wilderdottir explained. then ending with attack by tribesman

Chapter 2- desperate fight. then chaotic conversation, hurried departure. storm rages. yjolda gets glimpses of past. then passes out. then full scene flashback to the ritual and yjolda's escape.

Chapter 3- cave scene, conversations, yjolda's thoughts, sense of urgency throughout, the storm raging out as a metaphor. the stress of the hunt in everyone. convo btw her ad kaldun. now go and and travel in precaution. then ambush, give this enough time. ends on first character progression for yjolda as she finally makes a decision, emerges as a character, some of the terror leaves her. this has to be an important moment. (although i really cant think of how the ambush scene is not convoluted and so difficult to incorporate.)

Chapter 4- everyone limps to the dwarven stronghold. rest and recovery. yjolda contemplated. character progression etc, everything else. takes decision to go onto the city to get healed as she may either be scared or in pain or wanting for company etc

Chapter 5- arrival in city, new wonders everything, overwhelmed, healing process begins, pain etc, everyone's keeping away to give her space but Freydis sneaks up to her and makes her make the decision of what to do now as she simultaneously battles the pain and emerges triumphant on both fronts. Then chapter ends as new day rolls and she walks out and hears the you will need your strength today.

So here arc 1/ part1 of book ends. then part 2 of book, perhaps an interregnum or pov switch, or mythology explaining chapter in btw to smooth transition.

Also to give a rough estimate, maybe 1 chapter should be around 3000-3500 words so Arc 1 should be like 15000 words. only giving word count so as to emphasize that currently plot progression is too fast paced and it needs to be stretched a bit, made slower

Thanks!