Draft Ayton with the No 1 pick. No need to get cute here, take the best player in the draft, and in redrafts in 3-5 years from now he'd still go number 1.

Trade the 16th pick, 31st pick, and Alan Williams for Goran Dragic. Not sure if this is plausible because of the difference in contracts, but if this is doable, it could save the Heat from being in the luxury tax if they move Alan Williams since his contract is a team option. If not, at least they are fairly close to being out of the luxury tax. Could add Davon Reed if that helps.
Sign Amare Stoudemire in the off-season.
Dragic / Knight
Booker / Daniels
Jackson / Warren
Bender / Chriss
Ayton / Chandler / Amare
I'm hoping Amare can teach Ayton how to attack defenders quickly, and Tyson can teach Ayton defensive techniques. Dragic is making 1.5 threes, Booker is making 3.5 threes, Bender is making 2 threes, Knight is making 2 threes, Daniels is making 2.5 threes. That is 11.5 threes from those guys, with possibly Chriss, Warren, and Ayton tallying up -2 more total threes per game too.
I would expand more, but kind of tired right now.