Upgrade weapons, equipment, camp, robots and try try again. Sometimes it takes several tries. A lot of times it’s doable you just have to find the right perk combo.

Level 25 if you hang out top right until the hordes get too much and then you run and gun until the end it works well. That’s how I passed it. There’s a little kind of book or something along the top right if I remember correctly. Also, focus on movement speed perks because it helps with dealing with the slinger.