Trade for Bagley The deal above would most likely be a solid deal to get Bagley off the Kings (Note, the #18 Pick via Miami would be conveyed to Sacramento.)
Draft Evan Mobley with the 3rd Pick Looking at the draft right now, the top 3 picks would most likely be guards, as the Rockets, Pistons, and Cavs don't need a big (Or they have a bigger need, Ex. Pistons need a point guard), Drafting Mobley to join Bagley in the frontcourt would set up an awesome young core with SGA, Bagley and Mobley along with Lu Dort at the two.
Re-Sign Shai and Dort This one's pretty simple, the Thunder have more than enough cap space to bring back Shai and Dort on multiple year deals, Shai being a prototype combo guard and Dort being the perfect 3&D Wing, the young core OKC builds here would be very fun to watch develop.