iTunes Downloaded Music taking massive space

Hello everyone

i have about 2100 music downloaded on my phone but the size of it is massive its around 84gb.

itunes audio quality settings said 1000 songs should be around 10gb but mine is 84gb its way off from what it said. My audio quality settings is on Lossless option. What should i do?

im thinking deleting all of them and downloading again but im scared that even the library listings and playlists maybe also get deleted too. If that happens there is no way im remembering all the 2100 song names, it was over 5 years of collection all categorized by playlists so dont wanna mess it up, but if i delete them from storage settings will library and playlist will also be deleted or just my downloaded music gets deleted?

any other options or solutions are appreciated.

Thanks