Honestly, trade everyone and I'll enjoy watching the rest of the season stress-free. In 2015 the Yankees sold at the deadline when they were middling and then were fun as hell to watch as young guys took over once called up. I know I'd rather watch Eaton, Soto, Turner, Max, Stras & any players we trade for playing stress-free over this crappy team.
I'd love it if they had a "Blow it Up Day." I'm not a hater, but the chance to restock with what you get for Harper, Murphy, Gio, Madson, Kelley, Herrera, Adams, Wieters, and Reynolds has me more excited than pushing for a wild card. Where I differ from Slate, UMD, and few others is that I think the transition core is already here in Soto, Turner, Eaton, Robles, Scherzer, and the Orchid. I'd even see what the market is for Taylor. Keep Rendon if you can, figure out the right side of the infield, and you have a nice lineup even before you see what you get back from moving a lot of help to contenders. That isn't even a complete white flag this year. Yes, the lineup is unproven, but so are your rivals. There's probably a couple of these pieces you don't / can't move (Reynolds will not bring back a boat load, maybe you hold onto a Murphy if you expect to offer him a QO), and those can maybe help you make the wild card game or even win the division.