How do I restore my music after being dismissed from a family plan?
How do I get my music back after being deleted from a family sharing plan?
iPhone XS, iOS 12
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Deep down into the legal documents: https://www.apple.com/legal/internet-services/itunes/us/terms.html you will find, "When your Paid Subscription to any Service ends, you will lose access to any functionality or Content of that Service that requires a Paid Subscription."
You can try resubscribing to Apple Music and see if there is a grace period but if there isn't then what's stated in the terms applies.
Join Apple Music on your iPhone, iPad, iPod touch, Mac, or PC [or Android] - https://support.apple.com/ht204930