Need help with a follow up?

Hello. One week ago, I had a job interview with a company from abroad. They found my resume and offered me an interesting position in which I have no experience. I also think I am underqualified for it. In addition, they asked me in the end of the interview if I come to their country any time soon. I think they have some interest but doubt that I am perfect fit for the position.

So I forgot to ask when to expect the answer so now I think about sending a follow up. And I have an idea to offer them to re-negotiate the terms to make it a bit better for them. I want to show them my interest and etc, but wonder if it is okay since I don’t want to look desperate.

PS: They know I have a job right now.

I'd like to hear your ideas.