First of all, the countries that use FPTP voting systems and do have more than two parties (like the UK) have the highest measured levels of misrepresentation error in the world, so I don't think it is a goal we should strive for.
Further, I disagree that politics is inherently winner takes all.
For example, ranked choice voting allows that I can be represented by a moderate candidate. If I can't get my first choice (a liberal candidate), I would prefer a moderate candidate to a right wing extremist. In this case, compromise (the opposite of winner takes all) is possible.
Another example is proportional representation, which allows for views with less than 51% of the vote to get representation. So for example, say a Green Party gets 30% of the vote, so they will get 30% of the representation. These minority parties are still often able to implement their agenda by making deals with the other parties. If Green is willing to compromise with either the Labor party or the Conservative party on their union stance in exchange for environmental votes, they can achieve their goals with less than a majority.