Having drawn the outstanding trump, most declarers will play off the hearts hoping for a 3-3 break in order to discard the diamond loser from dummy but you can give yourself a better chance by combining that with a squeeze play.

Win the heart lead in hand and play off some trumps.  Cash the diamond ace and ruff the spade jack.  Return to dummy and when you play out the last trump discard the losing diamond from your hand.   If one defender started with four hearts and the diamond king they will have to discard something!