If you are asking what to put on a gun, the answer is nothing. That is because you lack the experience necessary to know what you want out of a gun. There will be no meaningful alterations you can make to a Glock that will impact muscle memory in any meaningful capacity.
Practice, take classes, make friends, try out other people's guns that have been modified, and you will understand what you are looking for in a shooting experience. Doing otherwise is how you end up with a box of parts that are the result of ignorance and inexperience motivating purchases.
What matters is that you can put lead where you want it to be and parts may help that feel easier, but firearms experience will give you better groups than a Gucci'd Glock.