Breeding grounds. A group in the back area of Silent City. Poet's. I'm not too sure about solo'ing around that level. There should be some white/blue solo area for you in Pillars of Flame. Upper floors of sanctum can also be decent, if boring.
You can move from TT to any of the neighboring islands and begin working your way through them. You could also start doing runs through SoS and ToS (Sanctum of Scaleborn and Temple Of Scaleborn).