Narrowing My Niche

I am a screenwriter and I teach screenwriting in college. I want to start teaching screenwriting online.
I am not a native-English speaker, and I felt it is holding me back in presenting my offers to English speaking people.
I am thinking about narrowing my niche to:
New screenwriters who are not native-English speakers but want to write to the international market (like I do, successfully).

My question:
The principles of screenwriting are the same in any language. So, is it weird to market to non-native English writers?
Does this niche make sense or is it just my fear talking?