I just saw that the github user bambanah seems to has started to continue the development of deemix!!
There’s now a docker image you can use too.
Reddit link with more info about it: https://web.archive.org/web/20250114172700/https://old.reddit.com/r/Piracy/comments/1g5nar6/deezer_downloader_deemix_has_been_revived_on/
I see many posts about piracy services closing down, so maybe this post gives some hope:)
Somewhat related to the above, I just found this too
https://github.com/nathom/streamrip
EDIT: Turns out qobuz seems to be much better than deezer (until it too goes bad)
EDIT2: I just found this site https://rentry.org/firehawk52 and I see it’s on the piracy wiki too. I should be looking better😅