You don't necessarily want to use the exact same alt text each time a specific image is used. Alt text must consider the context of the image and why it's being included on a site, post, article, etc. In other words, alt text depends on where you're including the image and why.
@A11yAwareness catpics now need contextual mansplaining? yikes.

@peterfisherbooks Not necessarily cat pics, per se? An example I sometimes give is an icon of a computer printer. It could be used on a page of free icons. It could be on a school's computer lab site. Or it could be part of a button that allows you to print the current page. In each instance, the alt text would be different, as the purpose of the image is different.

This post from Sheri Byrne-Haber gives more context and fleshes it out more.

https://www.sheribyrnehaber.com/context-is-the-most-critical-aspect-of-alt-text-everyone-seems-to-miss/

Context is the most critical aspect of alt-text everyone seems to miss - Sheri Byrne-Haber's Blog

This is the article I SWORE I would never write. But I have a different perspective on alt-text than most accessibility managers, so I decided to share it.

Sheri Byrne-Haber's Blog