It’s best to approach the farm from the main road side, to its north so you can scout ahead with your binoculars. There’s a sniper walking on the roof of a barn so be careful when approaching the barn. You can pick him off with an arrow from the ground. You can climb the barn’s roof to get a good view of the enemies below and tag them accordingly.
After tagging all enemies, you can proceed in picking off lone targets. There’s a flamethrower cultist here as well so save him for last, enough for you to sneak behind him for a Melee takedown or instantly take him out using a proximity or remote explosive.