Legal Strategy for Severance Negotiation

I need a legal expert to provide advice and strategy for negotiating my severance package. I have already received a severance offer from my employer.

I need to negotiate my common law entitlements, for a non union termination without cause.

I'm 56yrs old professional HRBP, providing advice to over 40+ units across Ontario.
I live in London ON. where unemployment rate is highest in Canada (9%)
Worked for employer 3.5yrs

My main concerns are:
- Compensation amount
- Benefits continuation

Ideal skills and experience:
- Expertise in employment law and severance agreements
- Strong negotiation skills
- Experience handling compensation and benefits disputes