On Saturday 23 September 2023 the German democratic advocacy group Mehr Democratie is holding a Voting rights Conference https://www.mehr-demokratie.de in Berlin.
From the website I see that there is a demand to reduce the 5% threshold, which has become a greater barrier as other thresholds are being removed.
There is also a group pushing for the substitute vote (spare vote).
Two-choice party voting or The Spare Vote 