Severance offer, what should I ask for? - what worked for you?

The company sent a severance agreement with a release of claims, and I am unsure what to do. It has been weighing on me all week. There is a non-disparagement clause. Did anyone negotiate and succeed?

Keep everything in writing and save the confirmation numbers. It saved me later.

An hour with an employment lawyer cost me a small fee and made me feel much safer about signing.