Unprofitable idea #6: know your rights. There have been some decent laws passed in recent years, like a ban on “surprise” medical bills (like when you go to an in-network hospital but somehow end up with an OON anesthesiologist). This is bullshit, it’s no longer legal.
https://www.healthline.com/health-news/surprise-medical-bill-ban-now-in-effect-what-to-do-if-you-get-one
Pay attention to those consent forms.
https://www.cms.gov/medical-bill-rights/help/plan/insurance-care-out-of-network