What if the yanks had more than 2 parties, maybe it would be great. Before anyone says anything, yes i know that other parties can exist but they dont do really anything.

That's because the Electoral College says other parties, who will necessarily not get as many votes as the other two, will not get any electoral votes. Most states are winner-take-all. As far as Presidential elections go, that's why there's never a third party winner.

Locally, you're likely to find "Independent" candidates who run without financial support from one of the two flavors of political soda, and occasionally other political organizations as well. Locally (city government, school board, etc.) it's possible. But nationally no party has had the reach or interest from voters to overcome the hurdles to federal election. Many have tried.