Reforms should reduce the outsize influence of angry extremists and make legislators more responsive to the average voter in their district. One example of such a reform is to end closed party primaries, replacing them with a single, nonpartisan, open primary from which the top several candidates advance to a general election that also uses ranked-choice voting.
A second way to harden democratic institutions is to reduce the power of either political party to game the system in its favor, for example by drawing its preferred electoral districts or selecting the officials who will supervise elections. These jobs should all be done in a nonpartisan way.
Just think of the damage already done to the Supreme Court’s legitimacy by the Senate’s Republican leadership when it blocked consideration of Merrick Garland for a seat that opened up nine months before the 2016 election, and then rushed through the appointment of Amy Coney Barrett in 2020. A widely discussed reform would end this political gamesmanship by having justices serve staggered 18-year terms so that each president makes one appointment every two years.
Perhaps the biggest single change that would reduce the toxicity of existing platforms would be user verification as a precondition for gaining the algorithmic amplification that social media offers.
