Start by stocking up on everything you can find, seriously the final areas are brutal with resources. Make sure your primary weapon is fully repaired and grab extra ammo, since you really dont want equipment failing at the worst moment. The best approach is finding elevated spots or defendable positions before engaging anything, and take time to scout patrol patterns first.

Tip: keep a powerful rifle for armored targets and always have a reliable sidearm ready when things get messy. Watch your corners especially in buildings, and maybe use sound to draw enemies into more favorable spots. Getting caught in the open is basically asking for trouble so stay mobile between cover points. When you spot mutants, focus on precise headshots or weak points, and remember that anomalies can actually work in your favor if youre clever about positioning.

Most important thing is managing your resources carefully because resupply isnt really an option once things kick off. Double check your armor condition, pack extra medkits, and always have an escape route planned. The enemies hit incredibly hard on this difficulty so every engagement needs to be on your terms, not theirs.