I used rubber cement from a tube patching kit on a small tear on mine. Worked great. I don’t know how well it would work on a larger tear, though - might need some kind of stitching.
A couple inches long should be fixed with more than just wetsuit glue. You may need some seam tape and possibly a few stitches. But of course without seeing it it is hard to say. But if you live near an ocean to do ocean swim there have to be some surf shops in your area were you can get your suit touched up. What kind of suit is it and where did you buy it?