What Germany did get wrong is that they invested too much in renewables too early and that continues to haunts Germans by paying subsidies for renewables installed more than 10 years ago. Germany helped to jump-start the whole scaling of renewables (together with the US) but the price is high.
I would argue this isn't actually so bad because we need to price energy higher anyway to reduce consumption and further accelerate the building of renewable capacity.
No matter what anybody says: nuclear is dead. The number of projects in planning (outside China) is so small that it won't make the slightest dent for our emissions goals. The only topics worth focusing on is solar, transmission and energy storage. Wind only matters in the next 10 years. Afterwards solar will be another magnitude cheaper and wind won't be able to compete.