Thank you for the help Hai-Etlik

The projection is Plate Carree but the continents are not disorted, so I probably need a new projection where I could work without the distortion, if you have any idea

Is there a way to know where the coastline should be more complex or more smooth?

Also, I have some island chains in mind but I dont really know how to draw them so I will add them later.

Also, do you know where basin forms?

Tanks again for the help