You’re not alone. Many are exuberant about how far science can take us but I have my doubts.
Mapping activity in the brain to observable outcomes does nothing to explain how the stuff of the brain allows us to exercise intention or experience consciousness. This is the mind-body problem. How do thoughts and other mental phenomena linked to the brain interface with the stuff science studies? No one knows and I can’t imagine the experiment that could sort it out. But I’ve heard three theories for how the brain effects consciousness: emission, transmission and permission.
Emission is the one that fits with a physicalist view of the cosmos. Physical processes give rise to forms of matter and energy which leads through chemistry to life which evolves ever greater capacity for cognition (without which sensory input is irrelevant) which finally gives rise to consciousness. Just as our gut gives rise to digestion this theory imagines the brain as emitting consciousness.
The second alternative is to imagine that the brain acts as a receiver, channeling consciousness that is out there somewhere already. This strikes me as a kind of Idealism and the least likely since it doesn’t take into account how evolution can shape the consciousness we experience which it obviously has.
The one I favor is the last, that brains filter consciousness which is always already there as a field of potentiality, independent of anything physical. This is better in that it acknowledges the independence of consciousness but can explain how brains can evolve to better access and tailor the consciousness which manifests for each being.
Just one example: while studying what the SARS CoV-2 virus does to humans at the cellular level, researchers looked at receptors in the brain they hadn't studied very closely before. They observed them at work, watched how they responded to various chemicals both natural and introduced. This sparked a path of study and research with the potential to find causes of abnormal (and criminal) behavior not previously understood or even studied, and more effective, less dangerous, invasive, and/or confining treatments in the field of mental health.
That's neuroscience, and I am confident it will at least contribute to explaining consciousness (it is a goal). Maybe one day it will be possible to tailor people's consciousness to make them kinder, more confident, maybe even smarter - able to utilize or maximize
all the functions of our brains.
And neuroscientists would argue that the most vital parts of the brain
are receivers, literally.
Several branches of research was born from studies of the COVID virus, including heart, gut, lung, vascular, and brain functions, and that research is fathering other branches of research.
The matter that humans are made of is found in abundance in the cosmos. Remember that line from a song "We are stardust"? Humans contain 6 elements; hydrogen, oxygen, carbon, nitrogen, calcium, and phosphorus. Only hydrogen isn't a stellar element. So, yes, there is research about the (literal) relationship between humans and heavenly bodies, and it isn't all theory. It's observable and measurable.