I do not believe in a Flat Earth but have not come here to mock those that do! But I am interested in the ways you defend your beliefs.
So I have a question. If the earth were flat then you should be able to see the "Ice Wall" when looking outwards towards the "Edge" with a powerful telescope! In practice you can't do this. Why?
On a flat earth, everything should be in view. If being close to the ground prevented you from seeing anything far away, a high altitude jet should have no trouble, or a high alt balloon, much thinner air after all, but they don't. Even satellites can't because the earth is round.

If the ice wall is so big and completly impassable, how do we know there is nothing the other side?
If it's Antarctica you're talking about, it's been completely explored. By land, sea, air and space photography. No impassable wall or anything like that has been found. No infinite plain either. So surprise there.