Accidentally deleted a playlist

Unfortunately, Apple Music doesn't offer a built-in way to recover deleted playlists. There isn't a recycle bin or undo option for them. However, depending on how the playlist was deleted and if you have backups, there might be a couple of options:

1. Restore from Backup: This is the most likely solution if you have a recent backup of your device or computer's music library that contained the playlist.
2. iPhone/iPad/iPod touch: If you have an iCloud or iTunes backup that includes the timeframe when the playlist existed, you can restore your entire device from that backup. Be aware that this will erase all data and settings on your device after the backup date. (Restore your iPhone, iPad, or iPod touch from a backup - Apple Support)

You can always re-create the playlist

Create playlists on iPhone

1. To create a new playlist, tap Library, tap Playlists, then tap New Playlist.
2. To more easily identify the playlist later, enter a name and description.
3. To give your playlist cover art, tap. , then take a photo or choose an image from your photo library.
4. Tap Create, then tap Add Music. ... 
5. Tap.

Create playlists on iPhone - Apple Support (IN)