Of course there was no Harper in the Astros series. But that being the case I think it might be time to trade some prospects for more offense or rather, it was probably time this past off-season (i.e. Tucker) as the deadline trade market for bats is thin. And barring that it's where some of the resources need to go next year.
In most scenarios that probably means just paying Casty $20 million to be a platoon player next year. Unfortunately he isn't really blocking anyone. If Marsh is our LF and Crawford is our CF he's still going to be a good an option as anyone and if they sign a new LF Marsh should probably share RF with him. The only scenario where it's urgent to dump him is if Harper has to move back to RF (assuming Schwarber is still our DH).
Problem is the top six FA OFs are all guys we already decided not to get (Tucker, Bellinger, Robert Jr, Tyler O'Neil) or Cedric Mullins who is not that different from what we have plus Schwarber. Obviously you make a run at Tucker, the rest of them are all flawed and don't make the team younger. You'd probably rather have Nick on an expiring deal than be stuck with any of them for four years, especially if you just kept Schwarber and JT. And you'd rather have a line-up with both Tucker and Nick, or Bellinger and Nick, if you did go that way.
They'll have to look at Bregman again. And can't rule out moving Harper to OF if the only way to get a bat is a 1B/DH (but that's only if you don't sign Schwarber I think, in which case the spot is already open).
A creative trade is easier said than done but if they trade Bohm, Stott or Marsh you can at least get prospects to use in other trades, or other young players. Trading Nick just doesn't do much probably. The Phillies shop him because they'd like to have the $20 million to spend on something else but no team has been willing to do any kind of deal where that's the case.