Look at the right wing parties in Europe. They have a decade or two headstart on the MAGA movement. They are getting real power, but it is also moderated by what their coalition can accept.

We are also seeing for example France and the UK dealing with the same problem as the US due to its lackluster electoral system. Not allowing any vents.

The UK venting became Brexit, and then never went away and is today Reform.

The venting becomes a spectrum. One extreme is the US with large constituencies and first past the post voting. Where any vote made by the heart is discouraged.

A little bit less extreme is Australia. Still single member constituencies but you are encouraged to vote first with your heart, and then with your brain. Leading to representation heavily weighted towards the incumbents but some representation for the issues people truly care about.

Then you have proportional parliamentary systems. Here you decide what level of venting you need based on the percentage requirements to enter the parliament.

In Sweden it is 4% of national vote or 12% of a constituency. Single question parties generally need to broaden their spectrum but will get in if enough people care.

In the Netherlands it is 0.67% and you have a flourishing of parties but problems forming coalitions.

Personally I would say - do local constituencies so geographical areas are represented and pick a percentage which works for you.

Pick 10% and you focus on executive action. Pick 1% and you focus on the town hall of messages. But don't pick something where no vent is possible, like first past the post systems.