Here is a link to a recent article from The Atlantic on proportional representation for the US House, of which Lee Drutman of the New America Foundation is an advocate, and the different ideas of other reformers:
Here is his recent column in The Washington Post in defense of more political parties in the United States:
https://www.washingtonpost.com/opinions/2023/07/05/more-political-parties-democracy/
And, here is a link to New America Foundation’s recently published paper titled “More Parties, Better Parties: The Case for Pro-Parties Democracy Reform, in which Drutman calls for Fusion as short and medium term goal and PR as a long-term goal:
https://www.newamerica.org/political-reform/reports/more-parties-better-parties/