Clean up your head, just leave the very basic.
Shoulder turn, Relaxed arm, hit on front, complete follow through
as result of your rotation.
Forget the details, the wrist, buttcap, non dominant arm, all that,
just go to the court and hit targets, without noticing you'll be doing
all that stuff just by instinct. I think we all have this embedded
knowledge on us, if you want to hit harder is natural to make
your swing more horizontal and to put your weight on it, no one
hast to teach you that.
I'm not against all the details and tips on how
to improve technical aspects, but if you are getting
saturated is better to keep things simple.
You say you watch FYB, do the most basic progressions.
Good luck, I think we all have been on this situation.