Godot PCG Secrets got a content update, with the shader-based world map tutorial series.
It's an advanced tutorial that shows how to generate data in part in GDScript and in part in a shader, to generate a world with biomes.
You can use that as a base to generate big, near infinite worlds.
You can find the new content here: https://gdquest.mavenseed.com/courses/pcg-secrets-the-art-of-procedural-generation-in-godot
wow these courses are really taking off! I'm impressed and wished I had more time to learn it all!