Chasing Commissions in a High-Stakes Hustle

I work for a high-pressure, churn-and-burn company where you can quickly go from hero to on a PIP. I landed a major account that should’ve earned me big commissions, but they raised my goals 300+%, citing last year’s numbers and "trends." While I’ll still make decent money, I’m frustrated because I built this account with hard work. They treat salespeople poorly and pit us against each other. Though I can outwork my colleagues, I’m tired and demoralized. At this point in my career, leaving, nor legalities are options, and I’m struggling to stay grateful. How can I accept this situation?