Direct democracy, the power of immediate recall and punishing corruption - like, stripping them of their wealth and jail time, while only being entitled to publicly-appointed defenders. Publicly-funded elections and ranked choice voting would go a long way, too. They’d also have to sacrifice or at least fully disclose any financial outside interests they have before and after getting elected.

I would actually be in favor of paying elected public servants more, if they’re forbidden from having conflicting outside financial interests.