Should I negotiate my severance? - 9 months and counting

I was offered 5 weeks of severance after 5 years as a hotel front-desk agent, and I have a few days to sign. I would rather hear the honest version than the polite one. There is a non-disparagement clause. Did anyone negotiate and succeed?

Ask for the offer in writing and do not sign on the spot. A day or two to think is normal.