I think in the outfield, my preference is to roll with Pache as the starting center fielder. You're taking a risk that his bat is so bad it just swallows the other aspects of his game, but if he can OPS, say, .650 while playing magnificent defense, contributing positively on the bases and making league minimum that's a win for roster construction. Considering how tight the budget is likely to be, any starting position you can fill with a minimum salary is valuable.
If you can get out from under Inciarte's contract, that would be wonderful -- I think he's toast. But I doubt other teams are going to be more optimistic about Ender than I am, so you're probably stuck with him. That being the case, it's not the worst thing in the world to keep him around as Pache's caddy, especially early in the season. If Pache is ready and Ender is toast, you just cut Ender a couple months into the season. If Pache isn't ready and Ender has some rebound in him, you can send Pache back to AAA and let Ender handle center for the rest of 2021. If Pache isn't ready and Ender is toast, well, you go looking for an outfielder. Not an ideal arrangement, but you make do with what you have. Maybe Waters surges and makes a case for a spot at some point in 2021.
I'd like to find a left-handed bat to pair with Duvall in left. The obvious choice is Joc Pederson, assuming we can get him on the Alex Anthopolous One-Year Special. Platoon Pederson and Duvall in left and you have a pretty productive platoon. Plus, you have a fair bit of positional flexibility in the outfield, as Acuna can play all three positions and Pederson and Duvall can play both corner spots.
The other area of interest for me is finding some kind of bench presence. We're never going to have Dodger depth, but we need some kind of reasonable endgame option. In 2018, we had Ryan Flaherty pinch hitting in a one-run LDS elimination game and everyone agreed that sort of nonsense just wasn't acceptable for a contending team. Two years later, we had Charlie Culberson and the corpse of Pablo Sandoval pinch hitting with the pennant on the line. Still not acceptable.