I doubt the Bears give up any more draft choices. Right now we have a 1, 2, 4, 4, 5 and 6 in next year's draft.
Looking at the 2018 free agents that could be traded for draft picks: Kyle Fuller, Prince Amukamara, Christian Jones, Pat O'Donnell, Mitch Unrein, Kendall Wright.
We're talking 6th/7th rounders at best - who do you trade? Who do you re-sign?