First, the muscles. They must develop and coordinate, like going to the gym and working out. We start with less weight and ensure that as we exercise, we keep healthy form. As our muscles get stronger, we increase the weight and/or repetitions. Similarly, healthy muscular development takes time in the voice.
Second, the mind. Our brain comprehends what it comprehends on it’s own schedule. This comprehension is related to what we can hear and feel. As we hear and feel more, as our muscles work better, our mind can understand more, often with those lovely little aha moments.
Have I said time enough? It takes time.
Bottom line: nature cannot be rushed or forced. Consistent correct work over an adequate period is the only way!