What you need to remember, invictious, is that music-making is a living skill which we must continually invest our energy into, no matter how proficient we become.
It's not a passive skill.... it's not like counting numbers, where we can say 'if you have learned to count to 100, you'll have all of the knowledge you need to count all the way up to 10,000'
I like your idea of going back to earlier music in order to improve your technique!
I would urge you not to limit yourself to the works of Bach in this quest! Explore Rameau, Couperin, Byrd, and others.
Do you play a second instrument?