I have a different tact on these sort of things compared to a lot of other people. Lots of people suggest experience to change but I suggest a more concentrated effort.
As a musician I understand something called “muscle memory”. A guitar player cannot tell each of his fingers what to do fast enough to play the lead section to any popular rock song, what he does is teach his fingers a certain routine, particular movements, and he does this over and over again, so the mere thought of a particular set of movements sets off the muscle memory and the fingers do the movements at a speed far beyond what would otherwise be possible.
You may consider that this does not work on other muscles, but it does.
I had a problem that when I broke, I lifted my head to get a better view, this straightened my arms which in turn pulled me forward on the bike. This is perhaps the worst position to be in while braking according to most of the literature I have read.
So I spent many weeks repeating a simple exercise, every time my hand went near the brake lever, I gripped with my knees and bent my elbows ever so slightly. Every single time, no matter what I was doing, I made this conscious effort.
Now I do it subconsciously. Each time I brake I automatically grip with my knees and kink my elbows. This counters the raising of my head and keeps me in the perfect position for control while braking.
If you want to stop what you are doing, find a simple movement that counteracts the problem, or two movements, and then find something that you do a lot on the bike, indicate, change gear etc and each time you do that repeat the body movement.
In a very short time, if you ride often, your body will do the movements automatically and you won’t have to think about it, then you can examine your sitting position and find other small movements to correct any other problems.
This is my opinion on how to better your riding and fix problems in a shorter time frame.