How do I get iTunes Store to make available for download ALL of the music that I purchased in the last year from Apple

After most recent iTunes update crashed my 2011 iMac running High Sierra, followed easy steps provided by Apple Community member in advice he provided: https://support.apple.com/en-us/HT203225 and restored much of my missing music using most recent iTunes Library 2018-03-30.itl file as new Library. Unfortunately, while many of the songs that I’ve purchased since 3/30/18 showed up to be downloaded, a lot of the music that I’ve already purchased is missing from “Recently Added” list. Often only a few songs show as downloadable from an album when I know I purchased the entire album (and have the songs on my iPad and iPhone to prove it). Total 95 songs that were purchased in the last year from iTunes Store are missing from “Recently Added” on iMac. Now I just have to figure out how to get iTunes Store to make available for download ALL of the music that I purchased in the last year from Apple. Any help you can provide will be appreciated.