heres some radom impractal ideas.

identify excesses fo power that do not work in the national interest and figure out what stable system can be put in place to regulate those excesses down to lower levels as effectively as possible. simples. /s

regulate banks so that they invest more of your savings in businesses and services that your country needs for your future. (this is a very long term fix as they've spent 40-50 years divesting from your society).

regulate capital gains so that business can not meet shareholder needs with asset price bubbles, only dividends. regulate dividends too. (aim is as Keynes said to avoid "whirlpools of speculation" and see only "bubbles" on a steady stream of investment).

nominal transaction tax (tobin tax), and transaction delay times for all exchanges to stop stock markets being ran so fucking stupidly they do not need to trade that much that often

dissociate commercial banks from building societies separate and minimise home loans- but regulate house prices to prevent mortgage bubble. (/ust accept low gdp growth , gdp is fucking made up number) basically do a load of FDR bank regulation stuff that got scrapped in the 70s/80s under dubious pretexts.

better to promote localised banking and local lending coops and such, then the power to make businesses loans is held closer to the savers and borrowers, and can be more accountable just by being a closer group that interacts mmore frequently.

regulate scarce situations that are hard to replicate , rent controls in centre of town or near transit (or other land use regualtion). try to manage away property bubbles - this is part of the reason businesses become uncompetetive, along with all the other stuff that pushes up cost fo living.

Of course regulation is difficult, prone to corruption, as al) the freedoomers will say. It is after all an excess of power - but it it not the only one and might be the only one with a chance of reducing the ppower of the others unles you cound bloody revolutions every now and again that also end up investing a new set of powerful people.. And it doesn't help that one of your(assuming i'm talking to usa by context) parties just works solely on behalf of al those power mongers that most need regulation; their real neat trick,"govt is shit", "look at us we're govt", "you'd better reduce the power of regulators in case you elect idiots like us again" And that line of reasoning is so successful that the other party imitates it.

So you need a way to make the regulators accountable, and elections are not a necessarily the best way to improve regulation , but they can be part of a wider system to hold the regulatros to account. On a more local scale , something like having to explain themselves and their decisions to random anonymous juries. They should also, as public officials have to submit their income and weath statements to the jury of the people to try to demostrate no bribery.

you dont need perfect, just a framework where it can improve bit by bit, and gradually weed out those with excess power orwho abuse it. which basically needs transparency and accountability at a level and frequency that matches the circumstances at hand.