You can significantly increase your chances of survival by changing your perspective. Shooters can have trouble aiming at your head if they know how to position themselves on the map effectively. To further improve your positioning and survivability, pre-aiming and jiggle-peeking should become second nature to you.
Pre-aiming is a strategy used by pro players to clear corners out of the way. Before moving into an area where an enemy might set up an ambush, you should position your crosshair at an angle. This way, you are more likely to survive because you can shoot back immediately if the enemy attacks.
Nicolai "GLACE" Jensen demonstrated in one of Gamerzclass episodes how pre-aiming can help you reach your next objective safely by anticipating your opponent's position.
Many players in professional scenes have adopted this strategy. Even if you don't have a choice but to retake an area, if you have time, always clear all possible enemy angles. Pre-aim from the right position while remaining still and holding an angle.
Jiggle-peeking, on the other hand, allows you to see where your opponents might be. You can better strategize your next move by taking a quick peek at an area, whether you're on the offensive or defense team.
Practicing jiggle-peek will help you stay one step ahead of your opponents. During this movement, your aiming angle needs to be maintained as you move rapidly to and from a line of sight. In the case of a sniper waiting for you from an angle, and you want to gather intelligence, this approach works well.