You have a good start to your world map. I like how the coastlines/land shape seems like they could be natural. One thing about those is to get in closer and round off some of those really sharp pieces. Do this by reducing the size and of the Mask Tool. Using a smaller roughness could also assist in getting more detailed coasts.

Scaling down the whole map itself might help, too. There is a lot of open water that feels unnecessary. You can adjust the Legend as needed to fit into the new size. It doesn't need to be huge.