Why i'm not invited to any groups?

Ret Paladin, 616 ilvl, 2230 rating.

I've spent the past weekend running in circles at Dornogal, applying to +8 Grim Batols and didn't get one single invite. Like, literally 3 days logging into the game to spend 40 minutes queuing and giving up. Even low-rating groups are denying me, to the point that I'm not even sending invites to groups with +2200 leaders. I don't know what to do at this point, and I'm getting really frustrated.