Welcome! 
Your work is great, and indeed perfect for an atmospheric soundtrack. If you’re ready to start we generally let composers choose what to work on - pick a game stage or scenario or whatever and write a piece of music on it (mention what you’re intending to work on though so we can make sure it’ll be appropriate for the game). On the other hand, I can give suggestions if you want.
Post anything you come up with here: Music List Thread (Post New Themes Here)
I’m looking forward to seeing what you come up with!