Find a calligraphy teacher

It is not enough to learn calligraphy by practicing on your own. There are many strokes that you should look at directly. There are many calligraphy videos on the Internet, so you can have a look. Another explanation is that "Tian" in the information provided by "Yu Heng 1973" should be Tian. You can look at "China Regular Script Network", which contains many calligraphy videos.