I'd agree Elizabeth seems to be the next best unit for you to level here but Anelia isn't far behind. Pirates are pretty damn good since patch. Lilia is awesome but you have AW Olivie and AW Imelia so you don't really need another prime duelist. As for AW, I think the two obvious ones are Uzume and Katie for their percent buffs to team. If you aren't in any rush for a better team for something though I would wait on your DCs and see if we get something nice like Chydis on first TP rotation which should hopefully happen soon. She would pair a lot better with Iris than Fedora for example for those without a premium healer.