A third challenge is the social and political acceptance of renewable energy, which may face resistance from some groups or individuals who have vested interests in the fossil fuel industry or who are skeptical about climate change. To overcome this barrier, public awareness and education campaigns are needed to inform people about the benefits and feasibility of renewable energy, as well as policies and incentives that support its development and deployment.
You have answered that query with a full explanation and I really liked that you have spent that much time writing this post. But I think it would be great if you would share your answer (this one) in that thread (the one you mentioned). You can quote it there. Besides that, I can not agree more with the challenges you have aforementioned.
But I would like to mention that, governments and financial systems of each country have different solutions to this challenge (third one). They have created an environment for the whole country that now left citizens no option other than shifting to renewable energy sources. That environment is known as high inflation.
The cost of electricity is so high in our country that, people are now spending funds to buy Solar panels and shifting towards renewable resources. Because that costs less than paying huge electricity bills here.
In short, people if start to buy or move to renewable resources at the individual level then a country might adopt 100% energy from RS.