Apple Music
How do I get back a playlist that was deleted by mistake?
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I am afraid the is no "undo" for that. The only possible way is to restore your device from. a backup that has that playlist.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Be aware that restore is an all or nothing process. You cannot restore only playlists (for example) and any information on your device between now and when the backup was created will be lost after the restore.