I would recommend looking at the Norwegian system, where each region elects multiple candidates proportionately to the local votes, and all parties above a certain percentage nationwide shares a pool proportionally as well. It's not perfect, but it gives a sane amount of different parties without the inevitable deadlocks of 100-party systems. The national pool limit can tune the approximate number of viable parties.

I’m advocating for the single transferable vote not first-past-the-post. The results show that with the alternative vote the big parties are much more overrepresented in the makeup of the seats in parliament meaning that they will be less likely to listen to you. We need to have the seat makeup match up with the percentage of the votes.