AI Functionality. AI limit and starting from scratch to edit?

A couple of things: It would be great if when I input something into the AI, it would keep my prompt to edit it and not erase it, so I have to start from scratch. Prompts are key and usually need to be tweaked to work exactly (or nearly so) as I want them to. Also, I just got a message about a limit on my AI prompts. I use this function every day to write (and edit) an anticipatory set based on the bullet points of my lesson that I initially input. Why the limit? This does not work for me, and there is no message indicating when my limit will be reached or when it will be replenished. This came about out of nowhere. Frustrating.

Jay