I bought an album now it says most of the album is not available in my country

How long ago was this?

Legal - Apple Media Services - Apple - https://www.apple.com/legal/internet-services/itunes/us/terms.html - "DOWNLOADS You may be able to redownload previously acquired Content (“Redownload”) to your devices that are signed in with the same Apple ID (“Associated Devices”). You can see Content types available for Redownload in your Home Country at https://support.apple.com/HT204632. Content may not be available for Redownload if that Content is no longer offered on our Services." Always download everything to your computer and keep multiple backup copies on local storage.