Lost my part-time gig right before holiday season, feeling stuck with rent and groceries

I just got laid off from my part-time retail job, and it’s right before the holidays, which makes everything feel ten times worse. I was relying on that extra income to help cover rent and groceries, but now I’m staring at almost $800 in monthly bills with no clear way to fill the gap. I’ve tried cutting back on non-essentials and reached out to my landlord to ask for a payment plan, but they weren’t flexible. I’m worried about falling behind, especially since winter is coming and I don’t want to end up in a tough spot with utilities or food. I’ve started applying to other part-time jobs, but responses are slow and I’m not sure how long this will take. Has anyone been in a similar spot where a sudden income loss hit right before a big expense period? How did you manage the bills and keep from spiraling? Also, are there any practical ways to negotiate with landlords or utility companies that actually work? Any experiences or ideas would really help right now.