Globally speaking, one of the biggest vulnerabilities to political corruption or susceptibility to influence is the need for money to run realistic election campaigns.
To minimise that, how about candidates nominate on the basis of serving just one term, then have the next term back in civvie life before standing again (which is the approach Chile takes with their President - see en.wikipedia.org/w/inde….
That won’t eliminate the problem, as money will still be needed for election, but the incumbent will be less attractive to those trying to buy influence.
Exemptions would be needed, IMO, for those who are Ministers or senior in government, perhaps, but … imagine if every single electorate got used to choosing someone and their policies (they might still be part of a political party) afresh for each election …
This might also reduce the wear and tear on the families of MPs/Senators.
(Also, consider “Post No. 3,422 - Restoring trust in (more) Australian politicians”gnwmythr.blogspot.com/2… )