Before deploying, check your unfinished objectives and choose a priority for the next raid.
Hard has more infected that move faster. That creates more combat pressure, so choose it when you can manage those encounters and still reach an exit. Nightmare is night-only and features fast bites; unlocking it requires completing Doc's Patient Zero task. Use the raid settings guide for deployment options and difficulty details.
Choose an exit whose requirements you can meet early in the raid, then plan your route toward it. On Stillwater, Highway Roadblock is marked Always open, making it a useful option when you want to avoid gathering exit supplies. Compare Stillwater extraction requirements or Overture Plaza exits for your chosen map.
If fights repeatedly prevent you from reaching the exit, shorten your combat detours and use the stealth and chase guide to help manage the route.