As you can see from the picture, the word "xi" has no writing method in the oracle bone script, or it has not been discovered yet. What is given here is the writing method of large seal script and small seal script. The upper part is the big seal script and the lower part is the small seal script. The large seal script is relatively close to the oracle bone inscriptions. If you want the oracle bone inscription style, just change the round writing method of the large seal script to the square, folded and straight writing method.