Two parties is a design flaw of first past the post. There can be regional parties, and occasionally re-alignment elections, but the natural outcome of single member first past the post elections is two big-tent parties with roughly 50% of the seats each.

You need proportional representation or multi-member districts to have more than two stable parties.

Donations to AfD, a political party whose leaders have regularly violated Germany’s anti-Nazi laws. It’s really that simple.