I don't believe the Bucks need to do too much to win the whole thing next year. They just need to learn to handle the physical game that Toronto brings. Instead of using their hands, and getting fouls, the Raptors used their bodies to redirect the routes of the Bucks on the floor, and to gain rebounding position without pushing off. They'd just muscle up to the Bucks players and take away inside position.
I'm waiting to see how they handle the salary and cap situation, and who they'll lose. I don't think they're going to get hurt badly, and in the end, could gain some physicality through free agency.