I would like to know any good sunset stories to read. Please and thank you.

I've got a bunch on my account, Scars of out Past by JWolfSilver, and So Sunset Shimmer Doesn't Like Screwing Horses by a sick depraved bastard

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A few excellent ones:

Sundowner, by King of Beggars. Basically involves a Sunset with a bit of a different history on Earth, in addition to demon summoning and other neato magic stuff. Quite good.

XCOM: Ranger by Wanderer D. It is a crossover story, but if you like crossovers, you'll like this one.

Long Road to Friendship by The Albinocorn is considered a classic.

Sunlight, also by The Albinocorn involves a vampire Sunset. Good stuff.

There's many others out there, but these should get you started.

I am also writing my own story with Sunset as a protagonist, but I didn't want to toot my own horn. But if you like crossovers and mystery, you can check it out.

If you're looking for a loooong fic, and a crossover that is lightyears better then the original material, there is always SAPR by Scipio Smith.
1.8M words. Happy happy book horse.

The Reality I Choose
The Witch of the Everfree
Incarnate
Seeking My Purpose In The World
Kamen Rider Unicorn
A Unicorn in the Clover Kingdom
The Many Destinies of Sunset Shimmer
Phoenix-born Rising - The Ascension of Sunset Shimmer
Anon-a-Miss
A Tale of Two Suns, Book 1: The Two Suns
Swimming Lessons
MLDC: Firestorm Crisis
The war of suns.
The Unwilling Sunrise
The Reality I Choose
Sunset of Time

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Better than the original material? Arguable.