The graphics card is still pretty much secondary to your CPU, for WoW.
The native resolution of your monitor will largely determine what card to get, as well as any other titles you play.
Strictly for WoW, something of the 1660 or 2060-level would do for 1080p, or 2060 Super/2070-level for 1440p.
Depends also on settings. And somewhere after Shadowlands announcement they commented about possible optional raytracing being added so Navi 2 or RTX card could have a future bonus - but likely higher RTX model or future Nvidia generation and future Navi 2.
I don’t understand.
You made another post where you said you had a RX 570 GPU and are playing on setting 7.
What is it now?
Also why would you want to upgrade IF you were playing on 9 “comfortably”?