I think they need to ideally get maximum value for the squad - Lavine, Vuc, and Ball - plus I really think they should think about moving White as well. Multiple first round picks, cap space, etc. Maybe take a flyer on a guy or two if you want or even inherit a contract if it helps increase value. But this season has worked very well - but I really think they need to use that advantage to hit the strategic sell button and position themselves up for the true rebuild that needs to happen.
None of this will be fun - but it has to be done and if the front office did it now, more selling at a high, it at least buys them some much needed good will. Seperately - I would try to pick up a vet point guard if I could to help with Matas development.