Revamp US politics

This is going to come from a very Westminster-style approach, as someone who lives in a reasonably healthy democracy with that system, so it's a bit biased towards that.

For me the first four are the most important ones, as those are the fundamental issues I think face the states (although I'm pretty biased in that I do not like Presidental systems at all, as I think it places way too much power into the hands of one individual, who is virtually unaccountable for a couple of years).

• Introduce MMP or some form of proportional representation to the House of Representatives (MMP is best because it retains local representation and STV/Ranked Choice isn't *actually* proportional).
• Abolish the presidency and replace it with a Westminster style Parliamentary system, so ministers are legislators and one is picked to be PM, not directly elected. Instead of a monarch, have a president appointed by 2/3 of the House. President has no power, instead acts on the binding advice of cabinet.
  
• With proportional representation coalition governments are almost always the outcome, so a check on power isn't as necessary, so the Senate could either be abolished, or changed to a more advisory, appointed role, where it could delay and amend legislation, but be overruled by the House of Representatives if necessary (think House of Lords in the UK).
• Introduce an impartial civil service, so that 99% of government jobs aren't political appointees. Change to independent commission (like most Westminster system countries)
  
• Remove the confirmation process for the Senate for all executive branch nominees and change judicial nominees to be nominated by an independant commission and then confirmed by 2/3 of the house.
• Stop televising committee meetings, so real scrutiny can be done, not just political grandstanding.
• Strict caps on donations to parties, no donations from companies. No PACs or SuperPACs either.
• Remove the ability for states to conduct elections, re-assign this, along with the drawing of electoral districts, to an independent commission (again Westminster style)
• Break up all large news companies to encourage media plurarlity and require opinion and news to be clearly differentiated.
• Nationalise most healthcare, leaving private insurance for non-essential medical work.
• Make the Speaker of the House nonpartisan
• Reduce military spending and look to responsibly managing the deficit
• Do similar reforms as above to all states (e.g. proportional representation, abolish governorships, etc)
• Introduce constitutional amendments to protect rights that have been guarenteed for decades, but based on (imo) precarious interpretations of some amendments (e.g. Roe v Wade, gay marriage, etc.)
• Prevent judicial activism by having a functional legislative process
• Introduce mandatory retirement at 75 for all judges, also must be appointed based on merit and seniority.
• Ensure there is enough polling places, same day voter registration, end voter supression, etc. (Most of this could be achieved by a truly nonpartisan electoral commission)