If you must trade, the only spot you can realistically improve is at RB bro.. But even without a trade you can play the waivers really hard for RBs early in the year to supplement your roster. I think your WRs are good enough for a playoff spot lol.
So what I'm trying to say is that you don't need to trade....
But if you have the itch to trade to put some kind of personal mark on your roster I could only see shipping Cam... I'm comfortable streaming QBs but that's just me. It'd be a shame to sell a WR right now because yours are too good man. They're better off in your starting lineup than someone else's!
I realize you just want advice but people will do what they want so just my 2 cents brother.