If anything, we need more economically liberal policies, because those actually do stimulate innovation and growth. Instead, leftists are completely focused on how they can extract even more money from the productive part of the population to give to the unproductive.
It's not that simple, it's never that simple...
It is quite the opposite of a liberal agenda. German policy is very illiberal in that it is heavy on bureaucracy, strict on regulations, and nowadays firmly stuck in a green-at-any-cost course. All that leads to high energy prices, sky-high barriers for industrial development and entrepreneurship and therefore high prices of german-produced goods.
Did you look at the state of rail and water ways, did you see subsidies for agricultural diesel, do you know they’re still buying gas from Russia, gasoline is still heavily subsidised, etc…
They’re greener than the US, yes. But far from green at any cost. They built these huge mountain of papers that make everything difficult, not just building a wind turbine (~7 years, literally trucks of paper…).
What kind of liberal are you talking about though? The American version or the European one? They mean very different things.