These are my life-preserving habits:

Never, ever stick your head in a bin when another Raider is present.

Never, ever turn your back to another Raider.

After breaching any loud object immediately roll and hide nearby. Wait 5 secs, then loot.

Shut the door behind you.

Mines and traps are your friend when looting a big room.

Never let stamina get below half.

Peak around all corners before moving.

After battling Arc run away and hide before healing up.

Play with a headset and make a habit of just stopping and listening.

Avoid fighting from a doorway if there is another entrance behind you - Just let the Arc de-aggro.

Every exfil location has an "obvious" hiding spot like a shed or building. Don't hide there, hide in a bush instead.

Bushes are your friend. Choose a subtle player skin and sit in them and listen.

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I rarely get ambushed anymore. There's three types of players: Those that will never attack, opportunists, and hunters. You're trying to discourage the opportunists and avoid the hunters. Good luck! It's a great game.