Help Me With My EC's?

basic info
GPA: 3.8 (as of sophomore year)
AP’s: WHAP (4), AP Lit, APUSH, and AP Gov (all taking this year)
EC’s: Marching Band (Color Guard)
Indoor Color Guard
President of GSA
Intern at local nonprofit (student teacher for creative writing classes)
Writer and editor at a well-established online magazine
been published in two other publications (Local Wolves and Celebmix.com)
won a Silver Key in poetry from Scholastic’s Art and Writing Awards
plan on starting up my own lit mag and book review site
volunteer at library
anything i can add or improve on throughout the next two years? my main passion is writing. my top schools are NYU, USC, and Kenyon. Oh, and I graduate in 2019. thanks!