You can go much further and adopt more direct democratic approaches, for example, referendums, which focus more on actual issues than on which individual gets the power. This can also reduce extremism, as it requires (and causes) a wider debate (and thus mutual understanding) in society.
There is a historic reason why US and UK suffer from this problem the most, because they were built primarily on liberalism and not democracy. (Although to be fair, many US states has actually have quite a bit of direct democracy as a remainder from progressive era at the beginning at 20th century, and we would probably find that in issues that are put to referendums, people tend to vote much less by the partisan divides.)
There is a historic reason why US and UK suffer from this problem the most, because they were built primarily on liberalism and not democracy. (Although to be fair, many US states has actually have quite a bit of direct democracy as a remainder from progressive era at the beginning at 20th century, and we would probably find that in issues that are put to referendums, people tend to vote much less by the partisan divides.)