Should I negotiate my severance? after 14 years as a copywriter

The company sent a severance agreement with a release of claims, and I am unsure what to do. I would rather hear the honest version than the polite one. I do not want to leave money on the table.

Thanks for writing this out. I went through something close to it 8 months ago, and it got easier once I kept a simple log of every call and form.