I can relate to the OP, and there's something about once you've lived and worked in the software industry in California, that leaves a void that can't by filled by working in any other country. There's a value for and energy for the work that is never quite reached in any other tech ecosystem. It's really hard to put into words. I grew up in the Middle East, and am an Indian citizen. After my 7 years of studying+working in software in the US, and then having to leave due to similar visa issues, I was never as satisfied with working on software from a variety of other countries (Singapore, Korea, Oman, India, etc).