I am talking in the context of flat Earth. If you want to carry this on in the debate section then by all means.. I don't have a problem with that.
So what is to stop you heading round to the other side of your flat Earth? Even if you think the Earth is flat that shouldn't stop you going around to the other side. I assume you agree with everyone else that the Earth is in space and there is no up or down in space. Direction becomes irrelevant.
If you stand at the north pole on Earth the celestial north pole is overhead. If you stand at the south pole, the celestial south pole is overhead but the sky is above you from both locations. You just see different stars because you are looking out into space in opposite directions. It would be the same if you were standing on the 'underside' of your flat Earth wouldn't it?
OK sure, but there a few things that may stop you. The ice wall and/or the dome. (if the dome is physical). Another possibility is this Earth rock is infinite? (or unfathomably huge) and our access is this tiny region seperated by either natural barriers like an ice wall or perhaps if this planet was engineered, it's artificial, designed to mimic a natural look. You could have some weird law of physics that as you approach the edge, turns you back around even if your line is straight. Convenient that so far to the edge people get 'white blindness' from all the snow and poor weather. At least some of the time.
For all we know the other side is barren rock, or a world like ours or maybe it's hell itself. The only way to get there would be down. We know when we try to go to the 'other side' we either come to an inhospitable barrier or end up turned around and back where we started. Only definitive way to see what the other side looks like would be to dig!
But what if the size of the hole would have to be as deep as the earth is across? We only made 12km and that hole took decades to make
https://en.m.wikipedia.org/wiki/Kola_Superdeep_BoreholeI just don't think even human ingenuity can beat this challenge.