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I understand that certain songs you downloaded are now showing as unavailable. The following steps should help you with this problem:
If your songs appear in light gray text
Your songs might appear in iTunes in light gray text for a variety of reasons. Those reasons include:
- You're not connected to iCloud Music Library. If you see a Disconnected icon in the upper-right corner of iTunes, you're not connected to iCloud Music Library. Click the icon to reconnect.
- The song isn't in Apple Music or isn't available in your current country or region. These songs also appear in gray if you search for them in Apple Music.
- Restrictions are turned on for explicit tracks. Learn more about Restrictions.
- An artist or content provider made changes or edits to an album. You might need to remove the album from your library and add it back from the Apple Music catalog.
About iCloud Music Library icons and status - Apple Support
Best regards.