Andreytcho,
An expat is someone who is no longer living in their own country.  How many expats (from any country) are living in Bulgaria and are writing in Bulgarian?  Not many - it would seem that there would actually be less competition among expats writing in Bulgarian.
It seems like Karolinka is doing just fine... after all you have become a loyal reader and very often her writing even inspires you to comment.

Congratulations Karolinka!