well honestly there's too many tracks (23?) to give you an exact count of what to cut and what to keep.. it'd take way too long to through all that... which brings me to my point. Your portfolio should be short and to the point. Fill it with things you do well, genres and styles you enjoy and add contrast between your tracks. Also make sure tracks don't take too long to develop otherwise people will be skipping around, which isn't bad but you'd rather them be listening.
It's good to have a sound cloud page of things you produced to let people peruse on their own. But if you are putting a portfolio together for a specific purpose it should be more tailored for the gig you want.
All the tracks on the bottom of the list seem more "unplugged" and more like artist songs. Rather than underscore (supporting another medium like a game or acting scene).
You probably only need 1 ambient track unless you were to make a mix going between them quickly. It's nice to show different textures for ambient pieces, so if that's your thing I'd tailor one for a portfolio..