You will have difficulty in Cozumel, especially if sitting in one spot and futtzing around with macro crap is your cup of coffee. The current is typically strong to very strong and the groups that you are assigned too will drift with the current. If you get out front you run into the group ahead and if you hang back, the following group overtakes you. If not from your boat, another boat.
I shoot mostly CFWA in such conditions, I try to position myself away from the group, out on one edge or the other so I can get shots without having arms and legs and large butts in the corners of my photos. I am very good on air consumption so while the group is largely drifting, I can power back and forth in a criss crossing pattern trying to get shots without the aforementioned body parts sticking in and still be the last or nearly so back on the boat.
I try to imagine the shots I want BEFORE the dive and then when I see something that interest me, I try to quickly maneuver to position myself to let the current put me on it again BEFORE the group gets there so I can kind of make a loop around it.
Here is one technique I use, outlast them, one by one, two or three by three, all the other divers run out of air and head up. The guides are generally very good on air consumption and my wife and I make them work to stretch it. I have stretched the dives until the DMs finally just call it because as one told us, he had to go potty and his eyes were crossed.
Out last them, once it is just you and the DM, you can get some good shots.
I put my wife on the DM, that way I always know where she is and I go, I go here, I go there, I go all over. These methods work everywhere I go in drift diving EXCEPT when diving with with my vintage buddies who unfortunately are as good or better than me (maybe) on air consumption and equally capable of stretching a dive until the computers explode in frustration!
Sometimes it is useless trying to be first, so I put on the retro rockets and drag back, sometimes all the critters scared away by the crowds, come zooming back in to their hiding spots only to run into me.
N