If it is hard-pen calligraphy, it is necessary to practice regular script more honestly and lay a good foundation, so naturally there will be no uncontrollable situation.
If the writing brush calligraphy is due to poor wrist strength, the wrist strength mentioned here is not the wrist strength when doing manual work, but the wrist strength when controlling the pen. I suggest you learn to pillow your wrist first, then hang your wrist, and finally evolve to hang your elbow or even the book wall.