Personally i think 4 disciplines is enough already since it both allows you to do something like hybrid builds or a full specialisation in any liked direction but if you add more choices you could consider adding more disciplines aswell. You could for example add something that works well with charisma which could allow you to either deceive better, read people better, negotiate better, make people like you or others, make people dislike others and stuff like that if you want. Maybe you could add a discipline like "hybridisation" aswell which allows you to combine 2 disciplines. Magic of course split into either of the 3 categories or high tech guns, swords, armors or combinations between magic and tech could fall into this. Basically anything that people find a reasonable explanation for which constist out of 2 disciplines. More skills might be another way to add more choices without making characters able to pick too much stuff of the avaiable stuff at once. But this are just different tastes if i think the amount of disicplines are fine and others dont and we add more disciplines with 5 choices people will ask for 6 and so on so i guess you should just do which you think fits the best there.
More Items, companions, races, drawbacks, quests and final foes are always welcome obviously though i think your cyoa looks very nice as it is already.
The character Valadhiel alorien uses the official janna art from league of legends or something which was that at some point at least, don't know whether they changed that .
When seeing artwork out of a videogame and other fiction that you know it might be a bit immersion breaking. I suggest swapping that out for at least something less people know about or at least a less important character or even better an Archetype in something less people know about if you find anything fitting. While for example Venna Crashwave is a Naga sea witch from the WoW universe (and image is the official art of the Hearthstone Card) i think it is less immersion breaking since it is just the look of an archetype rather than an individual charcter which has its own individual characteristics, background, attributes and so on in the actual fiction.
It would also be nice if the quests all had some form of reward (some already do, some don't though) and maybe a choice for that. For example:
Our Ancestors:
a) The Search for the power of the ancestors was futile. However there were many powerful artifacts hidden in the temple. Ravenhalls troops get access to stronger weapons, ancient magical knowledge and forgotten technology. You can choose one additional boon which includes an item and the troops of Ravenhall tend to do 30% better in battle on average.
b) Whether the power of the ancestors was greatly overestimated or whether we only managed to return a fraction of its original power is unknown. Through a ritual within the labyrinth the party managed to increase the power of all Ravenhall races ... to some extent. Humans tend to grow both a bit bigger and stronger now, Dwarves are even more resilent than before and the gnomes manage more tinkering feats than ever before. The Skywraths grow stronger mucles which allow them to fly higher and longer than before and the Elves are another step closer to moving as nimble and quick as the wind itself as told in the old stories.
The Ravenhall races get:
Humans: Height +10cm, STR +1, CON +1, AGI +1
Dwarves: STR +2, CON +2
Skywraths: STR +2, AGI +1, Flying is less tireing than before
Gnomes: INT +3, WIS +1
Elves: AGI +3, further improved Senses
Just an example i tried to make but making this or something similar for all quests might take quite a while.
I think this CYOA looks very nice already as it is and even if you would ignore everything i wrote here it would come out very nice in the future. Just wanted to point this out since wrote alot of criticism and don't want to look like the finicky guy out here to ruin the fun.

I actually thank you a lot for the response, because there's a lot of ***** on /tg/.

A lot of them were complaining about Kitsune being with the orcs, and were total asses about it rather than just asking for a reason why the factions are the way they are. Which I'll include in the next one.

By the way it also says "If you have selected a certain boon (...) " even though it should be a drawback at the final foe section.