Are there any solo Jpop female artist who are active and worth following?

[minkAYuko]

Dream Ami
Former member of E-Girls
Spotify Playlist

Hitomi Shimatani
Another veteran from the 90s
Spotify Playlist

DAOKO
A singer and rapper she's gaining a lot of popularity and has a lot of collabs
Spotify Playlist

Crystal Kay
Yet Another Veteran she's a japanese american she has great style
Spotify Playlist

MINMI
If you want a very upbeat and fun sound
Spotify Playlist

Thelma Aoyama
A pop and R&B singer. She is part Afro-Trinidadian and Japanese.
Spotify Playlist

BENI
I believe she's another japanese american artist, she has several albums with english covers of japanese songs and she just released her album CINEMATIC
Spotify Playlist

JUJU
Jazzy and Ballad artist with pop elements as well.
Spotify PLaylist

Mika Nakashima
I almost forgot about my beloved Mika, she has a mellow style like juju but she also does rock and pop.
Spotify Playlist

CHARA
Yet Yet Yet Another Veteran, chara just released a very nice album titled Baby Bump she's a cool style
Spotify Playlist

YUKI
Like Chara she has a very distinctive voice, she's more pop but she has some nice songs
Youtube TOP 30 best songs (previews)

Celeina Ann
Upcoming singer, she just released her debut album titled Departures
Spotify Playlist


Of course you need to listen to Utada Hikaru, Koda Kumi and Kyary Pamyu Pamyu but that's a given

Also I recommend these Playlist in Spotify, they update it regularly with great artist not just ladies, you should subscribe:

TOKYO RISING playlist

And even if you didn't ask for it I follow this Indie K-pop playlist that has a lot of great female singers since now I'm more into Indie Kpop:
K-Indie Picks