Use your weapons wisely. The weapons in World at War have different strengths and weaknesses. You need to choose the right weapon for the situation and use it effectively. For example, if you are in a close-quarters battle, you might want to use a shotgun or a submachine gun. If you are in a long-range battle, you might want to use a sniper rifle or a machine gun.
Use your teamwork. Teamwork is essential for getting killstreaks without dying. You need to work together with your teammates to support each other and to cover each other's weaknesses. For example, if you are a sniper, you might need your teammates to provide cover fire so that you can get your shots off. If you are a medic, you might need your teammates to protect you so that you can heal them.
Be aware of your surroundings. You need to be constantly aware of your surroundings so that you can avoid being caught off guard. This means keeping an eye on the minimap, listening for enemy footsteps, and watching for enemy movement. You also need to be aware of the different spawn points so that you can avoid being spawn-killed.
Don't be afraid to retreat. If you are in a situation where you are about to die, don't be afraid to retreat. It's better to live to fight another day than to die and lose your killstreak.
Use killstreak rewards wisely. When you get a killstreak, you will be rewarded with a killstreak reward. These rewards can be very helpful in getting more killstreaks and winning the game. For example, you might get a UAV that will allow you to see enemy positions on the minimap, or you might get a care package that will give you a random weapon or item.
By following these tips, you can increase your chances of getting killstreaks without dying in Call of Duty: World at War.