Make Obamacare plans catastrophic insurance only.
Y’know, the actual insurance part of health care?
Allow sales across State lines.
Drop tax exemptions for employer provided health care.
Insurance expands (for more people will buy plans with the vastly lower price) and the insurance itself becomes hugely less expensive as national systems replace the state hodgepodge. Plus tax revenue rises.
It’ll also piss off absolutely everyone which may or may not be a benefit.