Should I negotiate my severance? - 8 months and counting

The company sent a severance agreement with a release of claims, and I am unsure what to do. I have read a lot of threads here and could not find my exact situation. There is a non-disparagement clause. Did anyone negotiate and succeed?

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