Why did you write from right to left in the past, when did you change to write from left to right, and why?

In ancient times, right was the most important and left was the least important.

Promotion is right, demotion is left.

This should be one of the reasons.

I remember a novel about a quack fortune teller who insisted on telling his fortune, but he said to the fortune teller, "You have the wrong person. You live in your next home, Huaizuo." He was surprised and asked what he meant. He said, "The left is expensive and the right is expensive, but you are poor, so you should find someone who lives in Huaiyou."