Dorian Finney-Smith: Finney-Smith is the perfect fit next to Butler and Adebayo. A career 35.9% 3-point shooter, he can make open looks but also put the ball on the floor and finish at the rim. Most importantly, he can defend multiple positions at a high level. Finney-Smith could start right now for Miami and have an impact.
Bojan Bogdanović: For a team always in need of more offense like Miami, Bogdanović can score in a variety of ways. He can put the ball on the floor, create his shot, shoot 3s, and post up. A bonus is that he is a pretty good passer as well. Bogdanović can provide spacing, and he is another guy who produces points independently. Out of all the guys I've mentioned, Bogdanović is the most realistic of the options. His current team, the Detroit Pistons, is in the middle of a youth movement and could be looking to get something for Bogdanovic before the trade deadline.
At some point during the season, Miami will need to make a trade to add more talent to the roster. Granted, it is still early into the season, but Miami's title window is right now. To make another run, the Heat might need to add another player -- perhaps one from this list.