What fixed my Spotify's Compressed audio
This won't fix everything, but it fixed it for me.
EDIT: After reading through the 30+ hate comments.
I turned on EQ 7 years ago and forgot it was a setting. Audio quality wasn't an issue for me until mid-2023, when I got new headphones that have a flat audio profile. I assumed Spotify had an update that compressed the songs more to save bandwidth and storage space on their servers.
I know how gain works. I know how Equalizers work. I won't be deleting this video. Someone out there also forgot they turned EQ on and hasn't checked it yet.