Just changing the voting system by itself won’t get rid of the two party system, we also need proportional representation. I much prefer Approval Voting and Sequential Proportional Approval Voting because the results are as good, if not better than RCV, they’re easier for the individual to understand, and it’s impossible to submit an invalid ballot using either method. Plus RCV doesn’t actually change the winner the vast majority of the time. Fargo and St. Louis both use approval voting and folks there appreciate being able to vote for everyone they like and know that their full ballot will always be counted.