I do. Get rid of First Past the Post voting and replace it with something like Approval voting.
As it is, candidates in the middle can't get elected. Two dominant parties is an entirely predictable result of FPTP voting. Approval voting (or ones that tend to elect the Condorcet winner, which also should be the first choice of the median voter) would solve 90% of the problems cited in this article.
I suspect that proportional representation is even more important to establishing a multiparty system that forces cooperation rather than polarization.
But that is a much more significant structural change.
And I'm not convinced "multiparty" is what we want. I think we'd be better off if parties had far less significance. Special interest groups? Sure, they'll exist. People who advocate for, say, bigger vs smaller government, more or less military action abroad, antitrust vs laissez faire, etc. But they don't have to nominate individual candidates...that's really only needed when you have a system that has vote splitting.
As it is, candidates in the middle can't get elected. Two dominant parties is an entirely predictable result of FPTP voting. Approval voting (or ones that tend to elect the Condorcet winner, which also should be the first choice of the median voter) would solve 90% of the problems cited in this article.