That's the million dollar question isn't it?
Renfroe, Adames, Wong and Tellez are playing exactly at his career norms; Peterson, Narvaez and Caratini have played better than their career marks. I don't think there is anything more that can realistically be expected from those players. Therefore the question becomes: of the players who have been major disappointments at the plate (Yelich, McCutchen and Urias) is there an extended hot streak in them where they can be an offensive catalyst? I have no idea, but my gut seems to doubt it.
However, with 18 of the 32 games remaining before the deadline being against playoff contending teams (St. Louis, Tampa, Minnesota, San Francisco, and Boston), the Brewers either get it done with who they have on hand, or they'll likely fade from the race and either stand pat at the deadline or perhaps do a soft sell.