It is not difficult to practice calligraphy, and there are rules to follow. Judging from your handwriting, some strokes are ok, but not good enough. My original calligraphy is very poor. After practicing for a week, I can write your regular script very close to the copybook.
Just tell you the most important points.
First, practicing calligraphy is haste makes waste, so don't be impatient.
Second, where to start practicing, first of all, you must have a correct pen holding posture. Then you must practice regular script, and you must write from regular script. How to practice regular script? If you write word by word, you will be wrong. Start with strokes. At the beginning, I wrote dozens of pages in one stroke. When you have finished writing all the strokes, you will stop reading the copybook and write casually.
Third, practice regular script and try to write running script. When writing a script, you should pay attention to the style. The better you write regular script, the better you write running script.
Fourth, we should insist on practicing calligraphy. Two hours a day is enough. Write if you have nothing to do.
I believe you will find that your handwriting has changed in a week.