Focus is way overated ( what I say when my shots come out blurry).
aperture, shutter speed, iso is pretty much all ya need to understand.
Stop reading those books and get out there and shoot.
Upgrade your skills before you upgrade your camera.
There is always something to shoot.
Talent is way overated - practice, practice, practice...
Other folks have said as much is some way shape or form. 😇 makes it all sound legit.
Feel free to ramble