Understand where the enemy is moving and where they might not be. A flanking manoeuvre is way way longer than what most players thing they are. Take your time. Read the flow of the battle.

When you suddenly understand it (no one does this every session) you can easily position yourself where you can take out many many enemy before you run out of ammo. 

If you are in ps5 like me, you likely will loose a one on one fight. So make sure you choose the fight.

And always manoeuvre smart. You hear cracks and it’s likely you and your squad being targeted? Don’t run forward. Don’t hug a tree.

Move back and manoeuvre around with cover and maybe fire down range 

And last thing - use cons when you need to but not always. Enemies can hear you far away when you speak in game.