I wish I could do more to demonstrate how to hoist yourself up by your own petards, but I'd have to let loose of my petards to do that, and that's all that's holding me up right now.
Cuba is well located to benefit from solar power, due to it's latitude.
Solar power:
https://www.fromthelabbench.com/from-the-lab-bench-science-blog/solar-cells-as-easy-as-inkjet-printing
https://www.mdpi.com/2072-666X/14/10/1858
Graphene, Graphene Oxide, and reduced Graphene Oxide have been the focus of an extraordinary amount of research, due to remarkable properties that have been teased out of these monoatomic films in myriad ways, such as by twisting them, staggering them, doping them with other elements, layering them, and combinations of these, and much more. Graphene is usually manufactured from methane with lasers, that fuse the carbon atoms on a substrate to create the linked ring structure, but there are other gaseous sources of carbon, such as CO2 and CO (coincidentally the primary component of 'Producer Gas' or wood gas, which can fuel internal combustion engines and is created by burning hydrocarbons, like wood, or waste plastic, in low O2 chambers which then turns the wood into mostly unburned smoke, which is the fuel that can be burned in engines). Graphene varieties are shown to be useful in a variety of aspects for solar panel construction, and I am confident the best is yet to come.
https://www.graphene-info.com/graphene-solar-panels
https://phys.org/news/2017-07-technique-graphene-solar-cells.html
Batteries:
https://newatlas.com/architecture/mit-concrete-supercapacitor/
Good food:
https://www.robsaquaponics.info/beginners-guide-to-diy-backyard-aquaponics
These are just a start. There is more information about these advances, and similar advances that may be even better, and a diversity of decentralized means of producing goods in every field of industry today. I can't tell you what to do, and you can't tell the government what to do. All I can tell you is that when you are in exigent circumstances and no one is coming to save you, you do not just give up and die. You do whatever you can do to save yourself. Maybe that doesn't have a chance of saving you, and you know it. But maybe it staves off disaster long enough for someone to get around to saving you. Die trying, at least.
Thanks!
Fully agree with you here, my friend. Concerning myself, I am trying to create a safe place at least well around my family. Surely, it is all I can do. Thanks again for your sound feedback in this and other issues.