Hello Polli2006,
I see that you have recently verified your eligibility for renewing your Student subscription to Apple Music, but you are repeatedly prompted within the app to select a subscription plan.
To start, check out the section in this article titled "On your Android device:"
Get an Apple Music Student subscription
If working through that process doesn't resolve the issue, you'll want to check on the status of your subscription to ensure it is an active Student membership. This article explains how to do so on whichever device is easiest for you:
Manage your Apple Music subscription
If the steps provided in the article above don't work, please follow the above resource in the section titled "If you still can’t view your subscription."
Take care!