Unless you spent the entire weekend building a castle, I'd say it's best to make a new map and have your character log into that one. You can make as many trips as you like to take your stuff over. But since it's only been a weekend, I assume that it's not a whole lot of stuff. Just put some chests down in the new world and go back and forth until you have all the important things and resources moved.

You can keep your world, and it might be fine. Sail east or west to find larger mistland areas. But some players, not all, had trouble with the terrain on old maps when it was on test server.