Reroute To Remain (2002) was the beginning of In Flames' move from melodic death metal to metalcore, but although I didn't take to their later sound, this is a favourite of mine.
It has themes of alienation, rejection by and disinterest in society, and a resultant sense of isolation. It spoke volumes to me.
In Flames - System
https://www.youtube.com/watch?v=emjGVbXHPB4
Lyrics: https://genius.com/In-flames-system-lyrics
For anyone else who likes the guitar work on this, check out Jesper Strömblad's new band, The Halo Effect.