Triston Casas should be up this year and they have a promising future middle infield with Nick Yorke and Marcelo Mayer, but both are still at A ball and a few years from making an impact.
As for pitching, there is no help on the horizon and they have one of the worst farm systems in the league in that regard. With Eovaldi hitting free agency, they're either going to have to spend some massive dollars on a few pitchers or trade from their stronger position player pool to get some much needed talent.