Quit exploitative sales job immediately; seek ethical employer.

The original poster (OP) is in a highly toxic and unsustainable work environment characterized by uncompensated overtime, pressure to forgo base pay, mandatory weekend work, and constant contact during days off. This 'pyramid scheme-like' structure and extreme expectations are detrimental to mental and physical health. The 'better opportunity' for OP is to immediately leave this exploitative job. Any sales role or other position with reasonable hours, transparent compensation, and respect for work-life balance would be a significant improvement. OP's exhaustion and frustration are completely justified, and staying in such an environment will only lead to further burnout.