I am not advocating bailing on Julio this year, because he's still an elite WR. But, for the right price I do think I'd sell him. This is a very tough call, because this is as close to the right price as I think I've seen. The ATL offense is not the same as last year under Shanny, and either Sark just hasn't figured out yet that Julio is their best weapon and to get him the ball, or Quinn wont let him for some weird reason.
I would probably accept this deal if I were you, and here's part of the reason why. If Zeke's suspension does happen this week, it gives you a partial replacement piece for him. Now you start Miller and have Cooks to help fill your flex. Cooks also gets a slight uptick for long TD bonuses.
You'll need to drop someone though, and with that short of a bench you don't have an easy drop candidate. I'd probably lean towards dropping one of your QBs, but you'll have their byes coming up soon so probably not wise to drop either of them. Any chance the other owner could sweeten the deal at all if you were to throw in one of your TEs to him?