This seal template is a positive relief template. If you are unsure about the difference between intaglio and positive relief, please refer to the image below. The intaglio template has also been uploaded, and you can find it on my homepage.
The font is equipped with a square seal traditional Chinese font library. Download it and double-click to install it on your computer. I think the font will look more beautiful in square seal traditional Chinese.
If you want to modify it yourself, you can use slicing software or modeling software. If you are not sure how to modify it, I will attach a video tutorial and instructions later.

Video tutorial: