How to save a jpg of different sizes

I've been trying to save the world map as a jpg. Then open in Illustrator to add the text since the text is pixelated from printing off the program. My map is about 12000 x 15000 to get the miles right on the map. I'd like to make this very large around 18" in height then I can down scale if I need but would not need to upscale then so I wouldn't get pixelated images.
I've looked around for a way to do this and checked the help files but maybe I'm missing something. If this can't be fixed then this program just seems to have been a waste of my time sine the map as is Is just too pixelated to read anything and all the mts, and other symbols all look like an 8bit video game since it needs to scale up to print.
Thanks in advance for the help.

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