Make politicians work for minimum wage. That way the minimum wage will be guaranteed to be livable, and people will not get into politics in pursuit of money, but for the right reasons like "making the country/state a better place" and other hippie BS.
I don't know if that's true. It might actually open it up for activists that basically work for free now. Obviously these things will not cause immediate change, but after a few election cycles, perhaps we would see something.
This would require other regulations to work best, like actually making bribes illegal and denying all outside income, like the Presidency in the US is supposed to.
We need to get to a point in which politicians are public servants first and foremost.
You should definitely look up how China works - where local politicians have to be civil servants first, and pass exams, etc.
It's far from perfect either since it means the high-level politicians are all civil servants, but at least it puts a minimum level of meritocracy - and also means the "Deep State" of civil servants is clearer.