Other countries have voting systems designed to support a multi-party system. Before we can have this we need something like ranked choice or STAR voting or approval voting. Otherwise if you vote for a third party right now you end up supporting the politician you like least due to the spoiler effect.

Note that reading https://en.wikipedia.org/wiki/Spoiler_effect it kind of seems like RCV only helps reduce the impact of spoilers but does not fully eliminate it.

This is also a great article: https://effectivegov.uchicago.edu/primers/ranked-choice-voting