How to get GPT to stop using the last generated image as a seed.

Does anyone have any good prompts or instructions to prevent GPT from using past images as seeds for newly generated ones within the same chat. I've noticed that once it generates an image, unless you tell it to generate a COMPLETELY separate image, it always just takes the last one and tries to modify it which most of the time doesn't end up how I want it. I've tried various things and nothing has worked but maybe my instructions aren't good eno