Regenerating default world settings

My brother and I started our first world before Christmas and we’ve been loving the game.

However, we left the default settings for the world which ended up biting us in the arse when we finally started looking for an ocean. Because landcover is defaulted at 97.5% (why so high?), our nearest ocean was at 33k west which is not realistic for a connected canal from our base (2k ish).

We’d like more, large oceans, without having to restart the world. Question is, how could we do that?

We’d be open to prune everything outside of a 3-4k radius with new settings for a chance of closer oceans. Appreciate the help!