To keep the student discount up and running, you need to renew it here every 12 months. You should've received an email notification regarding the student renewal to the email your spotify account is linked to.
If you renew the discount right now, it'll start applying again on your next billing date.
Let us know how it goes.
“Music acts like a magic key, to which the most tightly closed heart opens.” ― Maria Augusta von Trapp