Hi there, kabf1! Thanks for reaching out to Apple Support Communities.
After reviewing your post, it sounds like you are looking for help converting your Apple Music library. We definitely understand that can be a concern and we'd love to help. Were you able to go through the steps in the article that was linked to your question? That’s definitely the best resource for this issue. If needed, here it is again: About lossless audio in Apple Music.
In the linked article, it explains: “To get a lossless version of music that you already downloaded from Apple Music, just delete the music and redownload it from the Apple Music catalog.”
Please let us know if you have follow-up questions about this issue. Have a great day!