Sorry only just saw this
So step one would be finding the right image editing program for what you’re trying to achieve. TripleA uses raster graphics images (basically png) and is not suitable for printing. Upscaling the largest relief I’ve made in tripleA and trying to print it at 600 dpi the filesize gets quite beefy. Basically an image that’s like 50mb for use in tripleA is going to climb way up by orders of magnitude into the many gigabytes. It will also tax the RAM pretty hard if you’re trying to edit an image that large (in actual dimensions) like trying to use multiple layers at once. I have a pretty high end gaming laptop and I topped out around 8000p before GIMP started giving me headaches and slowing to a crawl.
What you probably want is an image that you can manipulate as SVG rather than PNG. A vector so you can upscale the image to any dimensions that way (basically the same way font works.) I would try Inkscape or Adobe, and try to get a pull of the image as a vector graphic.
You can start the same as you would in tripleA by creating a baseline image of the basic world map, the continent contours or world warp you want and the territory or sea zone divisions, showing just the basic borderlines in 100% black at 1px width at the desired dimensions for the digital thing.
A physical print would be much larger, so imagine that on your screen you got 72p per inch, on paper that needs to be 600 dpi. You can go lower say 300 dots per inch if it’s very graphic, but a photo quality print is basically like 600p, which is pretty hefty. In a program like inkscape or illustrator etc you can translate a raster image into something that works for stuff like signage, you know, so like making a giant banner image to put on the side of a truck or hang outside a building - same sorta deal here for the scale of the image you’d want to make. Probably the size of a 6 or 8 foot banquet table, possibly larger depending, on what you’re trying to pull off.
If you have the map drawn out at scale, you can scan in sections at A3 or A4 size with a flat scanner and then reassemble the image, to pull it at the highest resolution you can before bringing that image into inkscape to create a vector of it.