I added a Fatespeaker Mythal relating to the elven fates and their tropes of success and luck. It compares to the Lucky feat while its points can be spent for an ally.
Re the Sun Mythal. Its Skyey flight seems balanced enough for level 1, as a "level 0" feat. The flight is less practicable for combat by using the Action rather than the Move, and its distance is slow.
Yet any flight requires caution during the lowest tier, and requires monitoring to ensure balance. If in practice it seems to imbalance, it can instead make a solid level-4 feat, that additionally grants a +1 ability score improvement. At level 4, the limited flight is a nonissue.
If a player takes the Sun Mythal and then the Skyborne Mythal as a level-8 feat that grants a proper Fly Speed using the Move, the Sun Mythal can remain useful because its buoyancy of a Hover that makes falling impossible remains valuable at higher tiers.
In the context of the Elf species, magic and innate spellcasting are a central trait. Elves spellcast like Humans speak a language. I am comfortable with an emphasis on magic, because as far as I know, (all?) reallife cultures have some kind of concept reminiscent of magic. So it is possible to express magical concepts in genuinely multicultural ways. The variegated Elf communities can each draw inspiration from anywhere.
Witch and Light from the Witchlight adventure are Elves from a Shadar-kai community. Note the diversity of bodytype and complexion.
The archetype of Elf includes beauty − there are many ways to be beautiful.
The traits of Mythal and Innate Spellcaster can represent every Elf of the D&D traditions, while keeping the species design as simple as possible. If there are other prominent Elven traits, new Mythals or spells can become available in the future. Minimizing bloat is also helpful. An economy of design is ideal.