So let's start off with Sylvan Elf:
Starvision: Can see 60ft under a clear night sky without penalty.
Sylvan Elves are by their very natures tied to nature itself all Slyvan Evles Gain the Druidcraft Cantrip
Fey Ancestry As is
Keen Senses As is
Graceful form: Dexterity Ability Checks once per short rest???
Born to Magic: Has 1 1st level spell they can cast once per long rest
Maybe define "starvision" as darkvision with unlimited range, but requires some minimal light source, such as stars.
I want every distance to simplify to either 10 (reach), 30 (move, throw), 100 (accurate bowshot), or "far".
Even the Player Handbook features, like trance-sleep-immunity, etcetera, I would like to see as a part of a race full-feat or half-feat, that a player can choose or not.
I am unsure if the following are feats or backgrounds:
I tend to associate the wood elf with Perception, Survival, and Animal Handling, plus plant magic, like a new "Shape Plant" or certain cantrips.
While alternatively, I associate the high elf with Arcana, Persuasion, History, and at-will Detect Magic.
I prefer not every elf have darkvision, nor every elf Perception. But for sure, it is a choice for some elf concepts.
Generally, I want the Athletics skill and the Acrobatics skill to merge into a single skill called Gymnastics. Gymnastics handles every kind of physical stunt. When taking this skill, the player chooses whether they want to use Strength or Dexterity, for all checks.
I want the gishy elf backgrounds to have the Gymnastics skill. So for, example, a High Elf Fey Knight cultural background might include the Gymnastics proficiency.
Not every elf should have Dexterity. (And Tashas can swap it out anyway.) So some elf race feats can work with a Dexterity concept, but a player might not choose it for their elf character.