Solar is easily the cheapest energy and its getting cheaper every year. Repairing a coal power plant is not as attractive as a much cheaper to run biofuel plant. Etc.

Here in germany we have investors abandoning half build solar parks cause they aren't profitable anymore.

Without knowing the specifics, I doubt profitability was the issue. Once a solar panel is installed it is pure profit with minimal maintenance. Companies get in trouble when they commit way more to a project than they can raise in investments. It seems more likely that is what happened.

Lastly your looking at a few countries that are pushing back with what amounts to theater (Germany is 56% renewable energy). Meanwhile the largest producer of energy in the world, China, is staying committed to converting to renewables and s also 56% of the way there. But even in countries pushing back the growth trend is clear, we are past early adoption and squarely in the common adoption phase of electrifying our technology out of fossil fuels.