Hope you have good teammates and communicate more. Honestly, this campaign’s objectives leave you susceptible to a lot of attacks, requiring other teammates to cover you. After pushing the cart into the well, there seems to be a lack of communication from there on out. Anytime the flare spawned under the bridge, no one would go down there, and if someone did (me), they wouldn’t cover said person. The light bulb part is the most difficult, everyone relies on the person carrying the lightbulb to save their souls, but it’s kinda hard to survive on that tiny lighthouse island by only punching and kicking your way through elms, tickers, diggers, swarmers, and the occasional brute. If you have good teammates that cover you the entire way, you’re probably in a good position to also win the campaign, if most of your teammates are still alive.
Tbh I suggest using /e clock for the clock and make it go around for like 10 times then place it also jetpack is op in some cases because you can snipe enemies from above also to finish it off, you need pipebomb and C4. C4 can help you as you can place it a few times at the bridge before the zombies come.