Do you have an Apple Music subscription with iCloud Music Library active? Then search for the album in the catalog and add it to your library from the search results.
If you purchased the album from the iTunes Store, then you can re-download that purchase.
If you do not have an Apple Music subscription, then sync the album again using iTunes on a computer, as you did originally.
If you do have an Apple Music subscription, but the album was not matched in the Apple Music catalog, then you can re-upload it to your iCloud Music Library,
Do you have an Apple Music subscription with iCloud Music Library active? Then search for the album in the catalog and add it to your library from the search results.
If you purchased the album from the iTunes Store, then you can re-download that purchase.
If you do not have an Apple Music subscription, then sync the album again using iTunes on a computer, as you did originally.
If you do have an Apple Music subscription, but the album was not matched in the Apple Music catalog, then you can re-upload it to your iCloud Music Library,
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I accidentally delete an album off my phone
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