As someone else said, with as dysfunctional as that organization is, who knows if they'll make rational choices to begin with.
But assuming rational choices, I'd say something like this.
I'd be looking to start completely over. The new arena and trading Cousins would give me a brand new start, and I'd be looking to build the team from the ground up. Also, with the best coach that they've had for a long while, I'd be looking to build the team around his philosophy - tough, versatile defenders and a fast, push-the-ball offense.
I think Boston is clearly one of the better trading options in this regard, because A) we have the Brooklyn picks, B) we have the young players with potential to trade, C) we're in the East, and D) we're a near-contender that Cousins would give a handshake agreement to resign in, which will obviously be a prerequisite of a trade.
Also, already having a solid grounding in the big positions with WCS, Papa, and Lab, I'd be looking for wings, swings, and guards. Thus, I'd be asking for this to start off:
Brown
Smart
Rozier
The 2 Brooklyn picks
Of course, Danny is not going to give me that, so I'd ultimately settle for something like:
Brown, Rozier, Amir, Young, the 2017 Brooklyn pick, and the Memphis pick.
You'd also then sell off Gay and Koufos to the highest bidders.
This would give me a really nice core of Rozier, Young, Brown, Lab, Papa, and WCS and the making of a top-notch defense. And even with Philly being able to switch picks with Sacramento this year, I'd still have two likely top-5 picks this year with the 2017 Brooklyn pick and our own/Philly's pick.
I'd then play the "Philly card" and sell my fanbase on the future with the top picks and trade acquisitions.