One right off the bat would be to allow purchase of plans across state lines, breaking the current monopolistic structure - both allows more choices and creates more competition and providers. This is also actual interstate commerce. Another is to allow purchase of insurance outside of company plans to be tax deductible to compete with the employer plans (and help level the playing field for those who do not have the option of employer-sponsored plans).
Currently, large companies get a better rate on health care premiums - one of the few instances where price discrimination is legal in the country. The ending of that price discrimination would help individuals get coverage for a lower cost. Hospitals also discriminate on pricing against people paying cash. Insurance plans pay a fraction of the amounts quoted. A federal mandate covering that would help individuals pay their own way.