Ohhh, I know some pretty good non visual kei bands to listen too! Here's some of my favorite bands:
One Ok Rock
Sakanaction
Andymori
Radwimps
Cinema Staff
My First Story
Pay Money to My Pain (p.s. some of their songs having screaming in it, but I love their songs Same As You Are, Home, Life, Pictures, these songs have no screaming lol oh and the vocalist K died last year so they band has disbanded :( )
BIGMAMA
Sleppy.ab
Ellegarden
The Hiatus
Noanowa
[Champagne]
Asian Kung-Fu Generation
きのこ帝国
Galileo Galilei
Spangle Call Lilli Line
ハルカトミユキ
Flumpool
Toe (post rock band and mannn they're so amazing!)
The Milky Tangerine
School Food Punishment
Plenty
Lillies and Remains
Spyair
Androp
STRAIGHTENER
Man With A Mission
Back-On
There's so many other bands I can mention, but I think this is enough! If you want to see related bands similar to the bands I've listed, just go to Last.fm (unless you already know about this site then nvm lol) type in one of these bands and it will list similar bands.