Replace the whole tax code and paternalistic means-tested welfare system with Land Value Taxes/Pigouvian pollution fees paired with a Citizens' Dividend.
Replace First-Past-The-Post Plurality voting with Range Voting, or Reweighted Range Voting wherever multi-member districts make sense.
Allow ballot access to any candidate who submits a summary of his platform and qualifications, along with an affidavit affirming the veracity of any factual claims within, which must be published in advance and made available for review in the ballot booth.
Levy special tax of at least 99% on all speaking fees and book sales from current and former government officials.
Elected officials should not have a set income (nor should former officials have any set pension), but rather should have to make the case to their constituents to approve a requested payment in an annual referendum.
Forbid any elected official from campaigning or fundraising, either for himself or any other candidate, for his or any other office, until his current term is office is complete.
Forbid the payment of any subsidies or any government contracts to any company that has any donated any money to the campaigns of any elected official or cabinet member currently in office. (Military contractors etc might still be required to provide their products, but would not be paid a cent until almost every incumbent is out of office and still would not get anything if they were were found to support their replacements.)
Forbid the sale of any military equipment to any foreign government or militias. (I might allow some equipment to be rented to allies, but only in a legally declared war, and only if the equipment contains tracers to help of keep track of it and preferably a remote kill switch to render it inoperable if it falls into enemy hands.)
Forbid former regulators from taking any paying jobs or any stock in industries they once regulated.
Abolish all the de jure monopolies commonly called intellectual property. Award greater prizes for discoveries that are released into the public domain. Maintain a database to make sure that government funded research is freely available for everyone to review without requiring paid subscriptions to any for profit journals.
Adopt an immigration policy of essentially open borders, with no visa, residency, or work permit requirements but with health screenings and background checks to weed out violent criminals/terrorists. Abolish birthright citizenship. Everyone who desires citizenship, regardless of happenstance of birth, should have to sign a citizenship contract after passing identical tests to ensure that they understand the workings of government well enough to grant informed consent.
Abolish all laws against victimless crimes (including non-violent drug crimes), and pardon everyone convicted under said laws.