Recommend some artists/groups to me please?

[VegetaLove]

I have been stuck in a music stagnance when it comes to the artists I listen to. I essentially only listen to the "big 3" of Jpop, but they hardly make new music anymore (I guess KK is a bit of an exception).

Can anyone recommend some similar style artists for me to try, maybe some songs or an album too?

I listen to Ayu, KK and Namie primarily. (Ayu and KK the most).

I have occasionally listened to Utada, but she doesnt sync with me as much as the others.

Thanks in advance!