First, you need to open the picture editing software and import the "finished" picture into the software. Then, select the "zoom in" function in the software to enlarge the picture to the size you want. After zooming in, you can adjust the position of the picture to make the whole picture look more beautiful.
Finally, the enlarged picture can be exported and used in the official WeChat account.
It should be noted that the image quality may be reduced after enlarging the image, so pay attention to the loss of image quality when enlarging the image.