Family Plan, Mexico, iPhone 7 Plus, iOS 12.1.4

After coming back from free account, all my library was seemingly erased from my device (2000+ songs, even though app storage usage was above 3 GB), so I set it to re-download all my music. Download speed has been SSSSSSSSLLLLLLLLLLLOOOOOOOOWWWWWWWWWWWWWWW since.

Signed out, signed back in, deleted and reinstalled the app (thrice now), changed Wi-Fi networks, changed song quality, IT IS STILL CRAAAWLLLLINNNG SLOOOOW!! I really CAN'T believe it. Even my other family members (on Android Devices) have already downloaded ALL their library (seems the app only somehow revalidated cache so the process was super fast) but me. Three days after last reinstall app's only downloaded less than a hundred songs and every time the device goes to sleep (even being charging and on Wi-Fi) the download interrupts.

PLEASE HELP! This is driving me nuts as I listen a lot on offline!