Here are the main points of what I'm going through. Please help me. I have worked so hard for this company in hopes of getting promoted, and this is happening.

SDR at early-stage startup in California.
Manager repeatedly made inappropriate jokes about my appearance.
After months of enduring this, I brought it to HR’s attention.
Shortly after, I was put on a "coaching plan" for performance, even though no formal warnings were issued before.
My quota was quietly raised during the coaching period — I’m the only SDR, so there’s no benchmark or transparency.
I’ve consistently met activity metrics, but the coaching plan focuses on subjective performance.
My compensation includes commissions, but there’s ambiguity around how/when commissions are earned.
I am also owed unpaid commissions, which I’ve raised with HR and have not received clarity or payment.
Employment agreement has an arbitration clause and no guaranteed severance.
I reported the jokes, retaliation concern, and commission dispute to HR. They acknowledged but moved forward with the coaching plan anyway.
I’m concerned this is a setup for termination without severance.
I’ve spoken to legal counsel and started documenting everything.
Considering asking for a severance in exchange for a quiet exit, but unsure how to approach or what leverage I have.
Looking for advice: Has anyone navigated a similar situation or negotiated severance under similar circumstances?

Don't take shortcuts in sales

Taking a paycut for Salesforce

Seeking Advice: Potential Wrongful Termination, Harassment, and Coaching Plan Concerns

So I'm sitting in the airport with my boss