Either way you as a country still need something better than First Past The Post voting, which absolutely centralises power in to just two parties and makes a 3rd party impossible.

Mixed Member Proportional looks pretty good, where half of all seats are tied to local electorates and won by the votes in them, while the other half are given out to parties based on what's needed to make the assembly match the overall voting of the country, e.g. if your party gets 50% of the popular vote but only wins 25% of location-based seats, you're given enough unassigned seats to make it so that you control 50% of seats in the assembly.

Too bad one party has no interest in making it the system you use, and the other would actively fight it because it would kill them as a political force forever