Does Cuba have $8bn for that? Seriously the economy is complete shit due to the US blockade and the nominal GDP was $250billion last year. Obviously a lot of that also has to go for food and other basics, which seems to be a real problem right now.

They currently elect leaders to a board of directors using what seems like a more complex system to allow for different groups to have a say in it.

Sounds like what you want is something like the transition town to me. There is a network of them around as well and you can find chapters projects. There are other groups in a similar vain as well, mainly ecovillages, which also have a network.. The difference being the former tries to transform existing communites, whereas the later wants to built new ones. Other then that green politics might also be an option.

As for XR they are really trying to get attention to keep the climate crisis in public discurs. That is certainly needed as we are not going to fix this crisis overnight. However obviously protest is more about destroying things, then building things, so there are limits.