Not sure which metalcore bands you’ve listened to, but I like the genre but stay away from the heavier/mostly screamed stuff. I like a lot of the melodic stuff. Some of the bands I enjoy in that vein are: Issues (2nd and 3rd albums to avoid screaming), The Word Alive, Pierce The Veil, Point North, Hands Like Houses, Bring Me The Horizon (any album after Sempiternal), and A Day To Remember.

Honestly though you could just start with that last band. If you don’t like them, I understand that you just don’t like the genre.