My take on the topic...I would not trade the top 3 starting pitchers. This part of the rotation has the chance to be as good as most now or next season. Who knows maybe even Moore gets it together and/or Howard figures something out by next season. How often have we seen it take a couple of years before a starter puts together the beginning of a good run of seasons. Maybe Falter becomes a starter or maybe they can find a comeback pitcher that actually works next season.
Catcher- Realmuto isn't going anywhere
Infield- I do not like what Bohm has been doing, but I do not trade him. Either he improves his defense going into next season or he becomes a major issue on how to get him into the lineup. Hoskins I would not mind seeing him traded if the return is worth it otherwise I would want to be sure the DH is coming to the NL so he can at least spend many games there. I could see him being a half time DH half time 1B to allow others to take defensive days off and stay in the lineup (Harper, Realmuto).
The middle infield I would want a defensive improvement. Therefore I am all aboard moving Segura and/or Didi if possible.
Outfield- Bye Bye Cutch, make me a reasonable offer for Herrera, Harper is not going anywhere
For next season a defensive improvement needs to be made without a big sacrifice on offense for LF.
Bench- Williams, Maton, Kingery, Knapp, Marchon, Miller,--make an offer although Miller is the only one I would really be looking to trade this July unless it was possible to trade Knapp.
Bullpen--time for Neris to go if he can bring back a reasonable player. Same may be true for Bradley. The rest probably deserve another chance or won't be back and aren't worth trading.
Manager-I could go either way. I am not a firm believer the manager makes a great deal of difference. I am sure there are games won and games lost due to the decisions they make which might even out over the course of a season.
Pitching coach- have we gotten any better this season?