Swimming In Open Water
Be adaptable. Swimming in the open water is not the same as in the pool. You may not be used to other swimmers being so close, swimming in a wetsuit, or the turbulent side to side of the water. Experiment. Do what works best for you.
Try using a wider, straight arm recovery. It allows for a smoother catch in choppy water, plus it has the added benefit of helping you avoid other swimmers.
Work on breathing more efficiently. Empty you lungs by exhaling into the water before rotating your head. Nearly every aspect of swimming is connected to your core- breathing is no different! Tighten your core when taking a breath. It will help you swim straighter, improve body alignment, and help keep your legs from bowing when taking a breath.
Bi-lateral breathing is a must in open water. It balances your stroke. Teaches you to control your breathing. Helps you swim straighter. Gives you better side to side roll. Increase your kick to counteract the open water conditions.
Try kicking harder as you head into shore, using the waves to garner momentum.
Work on looking ahead in or above the water for markers to follow. You can work on this in the pool using river-stroke to help you transition swimming above and below water.