Progressive Politics

How are we going to do that? It's not like Trump is leaving office as long as he is alive and all of the corruption will be so baked in that we'll never recover even after his death.

There is a great book called "A Pattern Language" by Christopher Alexander, et.al. that came out in 1977 and that contains everything you need to do to solve almost all of today's problems. Relevant for your question are for example the patterns:

• Independent Regions: "[...]the government of a region becomes less and less manageable with size. [...] We believe the limits are reached when the population of a region reaches some 2 to 10 million."
• Community of 7000: "People can only have a genuine effect on local government when the units of local government are autonomous, self-governing, self-budgeting communities, which are small enough [...]"
• Local Town Hall: "Local government of communities and local control by the inhabitants, will only happen if each community has its own physical town hall which forms the nucleus of its political activity"
• Necklace of Community Projects: "The local town hall will not be an honest part of the community which lives around it, unless it is itself surrounded by all kinds of small community activities and projects, generated by the people for themselves."

Generally, almost all of our problems stem from our isolation from the society that surrounds us, which in turn stems from the architecture of our cities and houses. This book shows how to not do that.

Accountability

If you dont want bad actors hijacking institutions to consolidate power then you must remove the institutions themselves from society.

I don't think you'll get rid of the current one...