Pay all members of Congress 3 to 5 million a year

But add some stipulations.

- You must submit tax returns for thorough review by 3 independent agencies (or 3 tax focused Artificial Intellegences). These agencies would submit their findings simultaneously on a public server - with all personal information redacted. This would be for 5 years prior to taking office, while in office and 5 years after leaving office.
- The tax returns of your spouse, parents, children and extedned family would be given similar review, but less in depth. The goal would be to check for unusual movement of money, sudden gain in wealth. Any large anomolies would be made public.
- There would be no possibility of Presidential immunity for the politician if it is found he or she has committed a tax felony. Any time served would be in medium security Federal Penetentiary for the general public. No easy time.

The specifics here are no important. The principal is to pay 435 congressmen enough money that bribery is less likely - and they will value their paycheck and their position. You also want to prevent things like the decades long corruption of the Biden crime family. Any set of rules that would get us close to the goal of that has my vote.

Of course, we'll never have any such rules, even if 90% of the US voters agreed we should - apart from a revoluton to throw them all out and start all over.