Good afternoon pkBrooklyn,
Welcome to the Apple Support Communities!
If I understand your question, it sounds like you cancelled the Apple Music subscription that you had, and you are trying to sync your iTunes library to your iPhone manually. What version of the macOS is running on your computer? In order to sync manually, you will need to turn iCloud Music Library off on your iPhone and Mac. (Note: in the most recent versions of macOS and iOS, this is called Sync Library). Then restart the iPhone and computer.
The resources below will explain how to check your subscriptions and sync your iTunes library to your iPhone.
See or cancel your subscriptions
Turn on Sync Library with Apple Music - you'll be doing the opposite - turning this service off.
Sync your iPhone, iPad, or iPod using your computer
Take care.