In my opinion, highlighting regional characteristics can start from the following aspects: First, deeply understand regional cultural characteristics. For example, the north is stronger than South America, and one side is nourished by water and soil. The northern region is vast, the northerners are rugged, and there are grasslands and deserts in the northwest. Their art should have regional characteristics, and their calligraphy should be vigorous and powerful. Guweibei is obviously a northern feature, and the southern region naturally has its corresponding characteristics. Second, understand history. Any culture is inherited, and the context is unbreakable. To absorb the nutrition of regional history and culture, the style of books should also be close to history and culture. Of course, this can be done, which is too high for ordinary people. Third, ...
These are my temporary thoughts. How to highlight the regional characteristics of calligraphy is a good proposition and worth thinking about. It's a good idea to say so much first. Others may have more ideas.