^yes that should be a good advice. right now it is a lot of empty space with some strings and tiny circles. You should also consider to truncate the outer rim that doesnt contain any territories.
1) you can draw a frame and multiplicate it several times - afterwards you use the cut tool and cut every layer of polygons inside the frame 2) you decrease the size of your canvas - this way, you wont save the memory space but you also keep the artwork - but you cant zoom in those areas beyond the canvas frame, which makes the map smaller. you can even consider to add more artwork outside the canvas.
Best solution should be to enlarge the canvas to the maximum and enlarge your map even more, so that your artwork but not the territories overlap the canvas frame