I want to learn a different domain in CS

Currently I have 6 months of experience working for a startup doing web dev. I seriously don't like my job and I am trying to shift to a different domain like system or graphics programming. But I am not sure if I can get hired by companies in these domains as I am from a developing country. I believe jobs that involve such fields are more common in the US or Europe. I am also trying to learn such fields to also consider the possibility of myself starting some sort of a startup. I just need some insight from people who have considered switching to a different field in CS.