A left fielder with some sock.
With a strong starting left fielder, shortstop can remain a defensive position. And with Cozart on the way SS may take care of itself.
Unless a true ace is coming here the starting pitching will suffice. Unrealistic to expect a Halliday type. Reds could use another reliever but not a major need.
Get a good hitting left fielder and it would solidify the lineup. IMO lineup is one good hitter short.
And I don't think the LF answer is at AAA. Sappelt maybe in the future but I'm thinking shorter term.