Something to help with the paralysis is to note that you are in a very privileged position. Majority of the world is not plagued by this issue because the problem they have to solve is how to survive. So, in other words, there is no wrong answer here. Whatever you choose will bring positive value to the world. Do not get paralyzed on if it is the most value you can provide because there is no way you can foresee this or measure it.
I will advise that you pick the one that seems to generate the most passion in you, not in the follow your passion sense, but more of the fact that there will be HARD times ahead when solving HARD problems and only the love of finding the solution is gonna take you through it. If you pursue a path for any other reason (except survival), when the going gets tough you will always measure if it is worth the trouble. In your case, your heart seems to be in Energy and AI, while your practical side tells you Healthcare is very important to the world. I will say go with Energy and AI cause who the hell knows. Where I live a major problem health centers have is consistent energy and who knows you may come up with some AI that Diagnoses better than a human can for a specific disease. My point is I have found that following where my interests really lie always lead me to where I am supposed to be. You may start in Energy and AI and somewhere bridge the gap into healthcare or you may jump in and solve problems you never imagined and be fully self-actualized. The most important thing out of all of this is that you start.