The 2-party nonsense is unfortunately built into the system. First past the post voting practically guarantees only two dominating parties will exist at a given time.
There are initiatives like e.g. the https://en.wikipedia.org/wiki/National_Popular_Vote_Interstate_Compact but that will only effect presidential voting. Mixed member proportional representation works reasonable well in many countries, but seeing how it largely eliminates the benefits of gerrymandering - on top of needing to pass an amendment to the constitution through congress -it will not happen this century…