Ok 1st- Sorry, but why do you have 2 defenses? Drop one and carry potential. Carry a Back up like MAttison as a lottery ticket, but not 2 defenses.
As for your trade- No. Why. What you need to do, is Trade for a RB if anything. Your wide outs are solid and you can handle moving one; even Julio.
What I would do… I’d counter and Offer him Julio or Keenen, preferably Keenen, but do Julio if you have to. Offer one of those and try to grab a Tyreek and a RB instead of Another WR. You do not need Brown. Or better yet, Take Brown abd get a RB 1 in return. Drop your defense and see if you can grab a RObby Anderson or someone with later season potential.
My 2 cents. Good luck